The Education and Examination Committee provides study notes to persons preparing for the examinations of the Society of Actuaries. They are intended to acquaint candidates with some of the theoretical and practical considerations involved in the various subjects. While varying opinions are presented where appropriate, limits on the length of the material and other considerations sometimes prevent the inclusion of all possible opinions. These study notes do not, however, represent any official opinion, interpretations, or endorsement of the Society of Actuaries or its Education and Examination Committee. The Society is grateful to the authors for their contributions in preparing the study notes.

Finally. In addition. I would like to express my thanks to the Society of Actuaries and Judy Strachan in particular for their patience as I have slowly re-worked the original 1991 study note. Such encyclopedic treatments are hardly user friendly. presentation of the major aspects of modern macroeconomic thought and provide enough relevant examples to bring macroeconomics to life in the mind of the reader. my appreciation to Arjun Jayaraman and Michelle Quinn for their assistance in the preparation of the manuscript. I dedicate this monograph to my family—my wife Claire. Paul Wachtel New York January 1997
i
. First.PREFACE Modern textbooks in Macroeconomics are more often than not weighty tomes of 700 or more pages. I hope that I have achieved these aims and that the readers will find the study note and their exam preparation to be a relevant learning experience as well. Finally. and my daughter Rachel. but concise. thanks to Irwin Vanderhoof who was kind enough to introduce me to the Society and to Richard Mattison who was the education actuary at that time. My aim in preparing this study note has been two-fold. I have written a study note that individuals preparing for the actuarial exams can approach on their own without a course syllabus to direct them to the important parts. particularly for students who are undertaking a program of self-study. I present a thorough. Second. my son Chaim. They make life both challenging and worth living and I appreciate their leaving me just enough time to finish this manuscript.

2% greater than GDP. Production in the government sector is therefore valued at the costs of the inputs. A given product. there is no explicit market price for the financial services provided to demand (checking) deposit holders in lieu of interest earnings on their balances. the final product is the cake sold by the bakery.S. In 1990. This sector is the government. for example. sugar. level of economic activity. For example. Thus. which means simply that all of the product is valued at its market price. GNP (Gross National Product) was the aggregate measure that was most commonly used. BEA statisticians must have a mechanism for distinguishing between the sugar bought for household consumption and the sugar purchased by the local bakery for use in its production processes. By final product we mean output absorbed by the ultimate users of goods and services.
1
. regardless of where the labor and property are located. residents. an output that is very difficult to value. In one large and important sector it is not possible to value output at its market price because there is not a marketplace where these goods and services are sold. The police force. In the latter case. we mean the consequences of a current act of production and we exclude the transfer of existing assets. We will then show how the measures relate to one another and derive some important accounting relationships that utilize information from each. say. The dollar value of output is determined by its dollar market price. final.S. We will discuss the basic elements of the income and product accounts that are used to measure the overall. This excludes intermediate products that are used as inputs in production processes. By product. The key words in our definition are product. there are instances in which there is no observed market price for output and the NI statisticians must impute a value. but the measurement problems can be complex. The most common aggregate measure is the product side calculation of Gross Domestic Product (GDP). On the income side of the accounts. and market value. However. or aggregate. The last key phrase is market value. can be used as a final product or as input into further production processes. On the product side. The aggregate emphasized was switched from GNP to GDP because (a) GDP is a more appropriate measure for tracking changes in economic activity and (b) most other countries use a GDP concept.CHAPTER I ECONOMIC MEASUREMENT NATIONAL INCOME AND PRODUCT ACCOUNTS Basic Definitions and Concepts The National Income and Product Accounts (NIPA) are a vast accounting scheme for aggregate economic activity. The overall level of economic activity can be measured by adding up either the value of output produced or the levels of income earned. In the United States they are prepared by the Bureau of Economic Analysis (BEA) of the Department of Commerce. the measure of aggregate activity is National Income (NI). For virtually all output of the business sector. this is quite straightforward. uses inputs such as labor services and automobiles to produce protection and law enforcement. an imputation for the value of bank output is included in the NI accounts. Economic activity gives rise to both output and income earned by the persons and machines involved in the productive activity. Gross Domestic Product (GDP) is defined as the market value of all final goods and services produced in a given time period by labor and property located within the U. which produces a broad array of services. Therefore. GNP was about 0. We will start with a conceptual definition of each measure. The concept is straightforward. GNP measures output produced by the labor and property of U. Prior to the 1991 revisions to the NIPA.

These include the value-added accounts. Note that this overall income and product account is only the tip of the iceberg. and net interest earnings).4 1.4 6.931. Some of the major entries are explained below. the $250 in cash that my neighbor gave me for my old car is receipts from an asset sale and not income earned in production.4 -9. rental income. A wealth of further detail and additional accounting statements are available. In addition to current data.The standard measure on the income side of the accounts is National Income (NI).7 516.5 -96. TABLE 1 National Income and Product.7 1. proprietors’ income.314.4 667. There are also some technical differences between National Income and GDP that will be noted in the summary of the formal accounts below. Similarly.0
2
.014.4 4. Thus. 1994 Personal Consumption Expenditure Gross private domestic investment Producer’s durable equipment and nonresidential structures Residential structures Changes in business inventories Net exports of goods and services Exports Imports Government purchases of goods and services Federal State and local GROSS DOMESTIC PRODUCT Plus: net receipts of factor income from rest of world Equals: GROSS NATIONAL PRODUCT 6. the $100 that my mother gave me for my birthday is a transfer and not income earned in production.2 287.922. detailed accounts for specific sectors.0 818. The key words in the definition of NI are income earned in production. the BEA maintains a vast historical record extending back to 1929 for annual data on the broad aggregates as well as quarterly data since 1947. National Income is income earned in productive activity by all the factors of production: compensation of employees and the earnings of capital (profits. and breakdowns of economic activity by industry.3 798.4 722. Thus. The Formal Accounts Table 1 shows a summary of the NIPA with many of the categories shown in the official accounts.698.7 59. It is a counterpart to GDP because the value of a product is equal to costs of production (which includes the income of providers of labor or other services) plus the profits earned in production. This distinguishes income in a NIPA sense from accounting income or receipts that result from transfers or from the sale of assets.

3 392. Output of goods and services is allocated among the final absorbing sectors: households.3 450.9 -13. the major components of GDP—the product account—are shown. misc. The entire output of the housing industry appears under the residential structures category of investment.
3
. the individual engages in a fictitious business which buys a productive asset—the house—rents it out (a service expenditure on rent).
818. statistical discrepancy. and services produced abroad.8
608.S. which guarantee that the accounting treatment of owner-occupied housing is appropriate. Thus.6
5. we will examine some of the elements of Table1. The first imputation is for the rental services of owner-occupied housing. The expenditures of the domestic sector include imports.Minus: Consumption of fixed capital Minus: Indirect business taxes.008. An important accounting convention in the product account is the way in which owner-occupied housing is treated. In the case of owneroccupied housing.3 211. business transfer payments.2 195. The second is an imputation for rental income that appears on the income side of the accounts.8
Although a definition of all the accounting concepts is beyond the scope of our present discussion. Imports. and receives rental income which accrues to the owner of the house. factors of production. This accounting convention means that rental housing and owner-occupied housing are treated symmetrically in the accounts.0 121.9 116. Equals: NATIONAL INCOME Compensation of employees Proprietors’ income with adjustments Rental income of persons with adjustments Corporate profits with adjustments Profits before tax Profits tax liability Dividends Undistributed profits Inventory valuation and capital consumption adjustments Net interest
Note: Data are billions of nominal dollars. which is the output produced by U. government.495.5 528. The purchase of a home is clearly not an expenditure of current consumption but rather an investment in a capital good that provides housing services. and the foreign sector. business.6 526. imports are subtracted from exports to yield a net absorption of output by the foreign sector in the product account. and there are two additional entries. At the top of the table. goods. It is a part of the service expenditures component of personal consumption expenditures. are not a part of GDP.1 4. however. About two-thirds of total output is absorbed by the consumption sector. or imputations.

which corresponds to the top half of Table 1. Third among these are the indirect business taxes (sales and excise taxes) which are part of GDP but not NI. The next two categories represent income received by individuals as proprietors or partners and income from the rental of real property. GDP and NI are equivalent measures of aggregate activity except for the wedge that consists of net receipts of factor income from abroad (NR). The final element of NI is net interest paid by business. The discrepancy is quite small and arises because the income and product side measurements of overall economic activity are prepared independently. which is not included as income earned in production: (i) (ii) transfer payments from the government (TR) and interest paid on the government debt (INT). We begin with a definition of GDP. Thus. which are included in the expenditures of the domestic sectors. However. Second is the allowance for the consumption of fixed capital that is subtracted because the capital income components of NI are reported net of depreciation. Corporate profits are the next item. and foreign sectors (X – M): GDP = C + I + G + (X – M) The net absorption by the foreign sector is exports (X) less imports (M).
4
. government (G). (Net of depreciation means that allowances for the wearing out of capital equipment has been subtracted. Before-tax profits consist of profit taxes paid dividends. and undistributed profits. At the bottom of the table the major components of NI are shown. and a breakdown is shown that consists of before-tax profits plus the accounting adjustments for the value of inventories and the adjustment to depreciation allowances. They are part of GDP because they are included in the valuation of final output. which consists of interest paid minus interest received plus net interest received from abroad. or remuneration from work. such as transfer payments to individuals by the business sector and a statistical discrepancy. and indirect business taxes (IBT).In the middle of the table are three items which represent the wedge between the aggregates on the product and income sides of the accounts. About three-quarters of NI is compensation of employees. That is: GDP + NR – CC – IBT = NI We now introduce the concept of Disposable Income (DI) which consists of resources available for spending by individuals.) The allowances are based primarily on depreciation estimates from tax returns. net interest represents another form of the return to capital. First. First among these is the net receipts of factor income from the rest of the world which relates GDP to GNP. respectively. The identity relates the income and product sides of the accounts since investment is part of output and saving is the part of income that is not spent. a simplified accounting framework which retains all the basic concepts used in macroeconomic theory will be useful. We will derive the identity between aggregate investment and saving which is an important building block for later analyses. GDP and NI. Since the NIPA provide the backbone for macroeconomic analysis as it will be presented. gross private domestic investment (I). A simplified set of accounting identities will be presented here. There are other items in this wedge. they do not accrue to any factor of production as income does. add income received by individuals. GDP is the sum of product absorbed by the consumption (C). depreciation allowances (CC). The Savings/Investment Identity The formal accounts include more detail than is necessary for macroeconomic analysis.

NFI = (X – M – INF + NR).”
•
In summary. X. and income from factors of production abroad.S. NR) over payments to foreigners (for imports. been negative in recent years as the government has run a deficit or “dissaved. there is investment and asset accumulation abroad. NI = GDP + NR – CC – IBT. the saving-investment identity is: I + NFI = PS + BS + GS A summary of the derivation is shown in Table 2 below:
5
. subtract those parts of NI which are not received by individuals: (i) (ii) (iii) retained earnings (RE). we arrive at the identity between gross investment on the left and national saving on the right: I + (X – M – INF + NR) = PS + (RE + CC) + (Tp + Tc + IBT – G – TR – INT) or Gross private domestic investment + Net foreign investment = Personal saving + Business saving + Government saving Net foreign investment. Thus. DI = C + PS. and interest payments.S. If NFI > 0.Second. First. substitute in the above identity for national income. claims on foreigners minus the increase of foreign claims on the United States. It has. The flow of payments results in a change in the investment position of the country. personal and corporate tax payments (Tp and Tc. note that corporate profits are equal to retained earnings (RE) plus corporate tax payments (Tc) plus dividends. receipts from abroad exceed payment to foreigners and the U. M. then the U. NFI is also the increase in U. is the excess of receipts from foreigners (from exports. Second. Finally. • • (Gross) Business saving is BS = RE + CC Government saving (the government surplus. we have
To complete the derivation. is accumulating assets abroad. and interest on the government debt paid to foreigners (INF).S. These two ways of looking at NFI—the current flow of payments or the change in capital holdings—correspond to the current account and capital account of the Balance of Payments (see below). INF). As the term implies. GS) is equal to tax receipts (Tp + Tc + IBT) minus government outlays (G + TR + INT). DI = NI + TR + INT – RE – Tp – Tc – INF
Thus. respectively). GDP = C + GI + G + (X – M). of course. substitute for GDP the sum of the expenditure categories. This yields C + PS = C + I + G + (X – M) – CC – (IBT + Tp + Tc) – RE + TR + INT – INF + NR Rearranging terms. for disposable income substitute its components—consumption and personal savings. three additional substitutions are needed.

Index Number Theory A price index is generally defined as a weighted average of price relatives for the individual components of the index. we will first discuss index number theory generally. Thus the value of the index in period t is It =
∑w
i
it
Pit Pi 0
9
. The ratio of nominal GDP to real GDP is called the implicit price deflator. If the quantities of final goods and services produced in period t are denoted by Qit and their prices are Pit . we would measure real growth rates by simply taking the percentage change in real GDP.15
0. In fact.35
0. Real GDP in period 0 prices would be calculated by making the same calculation with period 0 prices. Since prices as well as quantities change over time. Alas.4
0.2
0. The price relative is simply the ratio of the current price of the i-th item (Pit ) to its price in the base period (Pi0 ). life is sometimes more complicated. If life were simple.Figure 2 Ratio of Savings to GDP
0. real GDP is ∑ i Qit Pi 0 .1
0. then (nominal or current dollar) GDP is simply ∑ i Qit Pit . the standard measures of real growth rates and inflation rates for GDP published by the Commerce Department and used by forecasters and analysts are somewhat different. and neither percentage change is a satisfactory measure of the desired concept. We need a real measure that holds price change constant. nominal GDP is not a useful measure of the level of economic activity or output. Thus. Because measuring the growth rate real GDP and inflation are complicated issues.3
0.05
0 1960 1962 1964 1966 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992
Italy
Japan
Mexico
US
UK
Nominal and Real GDP The NIPA accounts defined above measured income and output at current prices. and we would measure inflation rates by simply looking at the percentage change in the implicit price deflator.25
0.

the fixed-weight index. which are constant over time and are equal to the i-th good’s share in total expenditure in the base period. The changing weights fully reflect any substitution away from goods which have become relatively more expensive. Qi0 Pi0 is the base period expenditure on the i-th good and the Laspeyres weights are given by:
wi =
Qi 0 Pi 0 ∑ Qi 0 Pi0
i
Substituting for the weights in the general formula for an index number yields the definition of a Laspeyres index:
It =
∑ Qi 0 P it ∑ Qi 0 Pi 0
The index is the ratio of the current cost of the base period market basket to its cost in the base period. Laspeyres and Paasche. Index numbers differ primarily in regard to the choice of the weights applied to the price relatives. will overstate the true rate of inflation. For the whole economy. and thus overlooks the major way people cope with inflation. Laspeyres and Paasche. Thus. A Laspeyres index uses weights. A Paasche index uses weights based on current period quantities. The index obviously has a value of one in the base period. There are two types of weights in common use. which maintains the base period expenditure weights. the Paasche index for GDP is the implicit price deflator described above. then the share in total expenditures of goods with large price increases may decline. The weight for the i-th good is its shares of current (t-th period) expenditures:
wit =
Qit Pi 0 ∑ Qit Pi 0
The Paasche index can then be written as:
It =
∑ Qit P0 i ∑ Qit P0 i
It is the ratio of the cost of the current period market basket to its cost in the base period. The fixed-weight or Laspeyres index calculation applies the same weights to the prices of an unchanging basket of goods.where wit is the weight applied to the i-th item for the t-th period. The choice between the two schemes is not arbitrary but has important implications. If they substitute away from such goods. Consumers search for substitutes for goods whose prices increase more rapidly than the prices of other goods. Let Qit be the quantity of the i-th good purchased in period t. the numerator would be GDP and the denominator would be current output valued at period 0 prices. In other words. is simply a matter of whether the market basket is fixed at base period expenditure patterns or changes continuously to reflect changes in expenditure patterns. named after the nineteenth-century statisticians who introduced them. Thus. the
10
. The opposite argument can be made with respect to the Paasche index calculation. Thus. The difference between the two calculations.

current period expenditure scheme may understate the true inflation rate. Looking at the ratio. one may be more appropriate than the other. depends on price changes between t and t–1 and the It − 1
quantity weights used are constant and relevant to contemporaneous experience. the rate of inflation calculated this way would reflect changes in the composition of product as well as price change.e. The implicit price deflator for period t is the ratio of current GDP to current output valued at base period prices:
∑ i Qit Pit ∑ i Qit Pi 0
The change in this measure from period t–1 to t would be influenced by changes in the Qit ’s as well as changes in prices. Neither index is perfect. but for some purposes. The chain linked index approach solves some of the problems encountered in measuring growth rates and inflation. In the 1990s government economists began to realize that there were similar problems with the definition of the real growth rate.t −1 Pit ) ( ∑ Qi . The drawback of the fixed weight deflator is that after a few years. using period 0 as the base period.t −1 Pi . the quantities Qi0 ) may not be a good reflection of current expenditure patterns. the base period weights (i. The level of the index is defined by:
It =
I t −1 ( ∑ Qi . is defined by:
∑ i Qi0 Pit ∑ i Qi0 Pi0
The fixed weight deflator compares the value of base period production valued at current prices to base period GDP (the denominator). the index compares price changes with quantity weights from the immediately past period. then the rate of growth in real GDP between t–1 and t is the ratio of real GDPt to real GDPt-1 less one. it is necessary to change the weights about once a decade so that they are relevant to the patterns of expenditures and output in the economy. Thus. The rate of change of this index. Pit ’s. The percentage change in this fixed weight deflator depends only on changes in prices and changes in the composition of output. Thus. For many years the rate of change in the fixed weight deflator was used as the standard measure of inflation in the overall economy. Index Numbers and the Measurement of GDP Growth and Inflation Consider first the inflation rate implied by the implicit price deflator. (
It ) − 1 . a better measure of inflation is calculated from a fixed weight deflator (a Laspeyres index). The fixed weight deflator. t −1 )
In each period. Chain linked price indexes were developed as a mix of the Lasperyes and Paasche calculations. a Paasche index. we see that real GDP growth uses base period price weights to compare quantities in t–1 to those in t:
11
. If real GDP is defined as ∑ i Qit Pi 0 . Thus.

the preferred measure of real GDP growth is a chain-linked measure. the decline in real output in 1974 was originally 1. the price weights will change over time and reflect the relative importance of different products in current production. Repeated revisions have made recessions appear less severe than when first reported.6 percent with 1987 base year prices. The base period has been changed seven times in the post-war period in order to keep up with the changing patterns of production and expenditure. A fixed (1987) weight calculation of real GDP overstates the importance of computer production because the quantity of computers produced has increased enormously and the weight given is the (high) base period (1987) price. With fixed base period weights.8 percent using the new chain-type measure. The chain-type calculation has another advantage over the fixed base period calculation of real growth. The single most dramatic relative price change in recent decades has been the rapid decline in the price of computer equipment.) Between 1990 and 1994 real growth averaged 2. which uses contemporaneous prices to weight quantity changes. For example. Over the same time period. but only 0. the historical picture of real growth was revised whenever the base period was changed. Thus. Since the start of 1996. These revisions do not occur with chain-type calculations where the relevant contemporaneous prices are retained for all calculations. ∑ i Qit −1 Pit −1
(The actual calculation in use is slightly more complex because it uses an average of prices in t and t–1. the rate of change of real GDP overstates the amount of real growth that has occurred because the increase in computer production is being given too much weight. other prices increased about 30 percent. the chain-linked measure of the rate of growth in real GDP from t–1 to t can be defined as
∑ i Qit Pit −1 − 1.2% using the old measure and 1. The effect of this particular anomaly (the decline in the relative price of computers accompanied by the enormous increase in output) on real growth measures has been so dramatic that the national income statisticians have introduced a new growth measure for real GDP. Thus.4 percent with 1972 base year prices. For example. Computer prices in 1995 were only about 35 percent of their 1987 level.
12
.∑ i Qit P0 i ∑ i Qit−1 Pi 0
This may not be an accurate measure of growth if there have been large changes in relative prices from the base period.

14
. Consider an example such as washing machines. a closer look indicates that some modifications to the motor assembly makes the machine consume less electricity which can lead to substantial lifetime savings in energy costs.Growth Rate of Real GDP—Chain Weighted Growth between years 1 and 2.0% Growth between years 2 and 3. It measures the price of a representative basket of goods purchased by consumers. If the CPI overstates inflation then social security payments have been rising too rapidly and that is something that a deficit-ridden budget can ill afford.3% Growth between years 3 and 4. there have been suggestions that the use of the CPI to index (or make automatic inflation corrections) to payments like social security pensions be reduced. In fact. Imagine that a manufacturer introduces a new version that is the same size as its predecessor and looks the same as well. fixed weight calculation. which collects a vast amount of price data from surveys of all types of selling establishments. The CPI is calculated monthly by the Bureau of Labor Statistics.5) + 4 (5000) = 50000 Year 2 GDP (nominal) = 37500 (50000 – 37500) / 37500 = 33. use real GDP calculated with year 1 prices: (42000 – 30000) / 30000 = 40. An important reason why the CPI overstates inflation is the treatment of quality improvements. The CPI is widely used to measure price change and is carefully watched. the increase reflects both and the statistician must determine how much of the $50 to attribute to price change and how much to attribute to quality improvements. which are used to update the weighting scheme about once a decade. The fixed weights reflect the importance of each good in the typical consumer’s budget. However.3% OTHER MAJOR PRICE INDEXES Consumer Price Index The Consumer Price Index (CPI) is probably the most commonly cited index. use year 2 prices: Year 3 GDP with year 2 prices = 12000 (2. a re-design of the drum and plastic parts makes this machine less likely to tear clothing. Furthermore. The purpose of the CPI is to track the price of a given basket of goods and therefore it utilizes a Laspeyres. in recent years there has been considerable discussion that implies that the CPI overstates the “true” increase in the cost of living. use real GDP calculated with year 3 prices: Year 4 GDP with year 3 prices = 59000 Year 3 GDP (normal) = 46000 (59000 – 46000) / 46000 = 28. On first glance. The price of the new model is $50 or 10 percent higher than the earlier model. Now does the $50 price increase reflect the costs of a higher quality machine or does it reflect a higher price of washing machines? In all likelihood. the statisticians collecting price data for the calculation of the CPI will record a price increase of 10 percent. This is clearly a better machine. However. It is clear now that conservative government statisticians have been systematically underestimating the importance of quality improvements. The market basket is determined from periodic Consumer Expenditure Surveys.

The product side of the account relies on data from various surveys and samples which are combined with benchmarks constructed from periodic economic censuses. as well as technical aspects of the calculation. In recent years government statisticians have been criticized because the data originally released have often been subject to substantial revision. These annual revisions.1% per year. the agency that calculates the index. we can turn to a very practical and mundane question. The mechanism is the tax collection system. Again. The first available data (the “advance”) are released during the month after the quarter’s end. the BEA undertakes a comprehensive revision project about every 5 years which introduces conceptual changes. The commission reported in December 1996 that the CPI probably exaggerates true increases in the cost of living by about 1. If the index number calculations are slow to introduce new products. calculators. The commission report says that about a third of the estimated bias is due to the fact that the CPI (a fixed weight Laspeyres calculation) does not take account of important changes in spending patterns. the Senate Finance Commission set up a commission of economists chaired by Michael Boskin to study the issue. In fact. Where does the data come from? Continuous measurement of all economic activity would be prohibitively expensive. often substantially.1% per year overstatement in the CPI would save the government around a trillion dollars over the next 12 years. important for both forecasting and policy purposes to have timely estimates of the data. It is important as a measure of changes in the costs of production. it has significant political ramifications as well. The Boskin commission estimated that correcting for a 1. However. Clearly many politicians would like to rely on such a statistical correction to balance the budget. The possibility of bias in the CPI is not just a statistical nuance. the initial estimates are based on incomplete information and are therefore revised. Data Sources Now that we understand the definition of GDP. provide a complete reworking of the data for the previous calendar year and often include revisions for 2 prior years as well. It is. The Bureau of Labor Statistics. uses new data sources and methods. There is a trade-off between speed of preparation and accuracy of the data. The NIPA data are valuable but not sufficiently valuable to warrant the expense of monitoring every economic transaction. the remaining biases are due to the fact that Americans do more and more shopping at discount stores and benefit very rapidly from an expanding array of new and better products. Producers Price Index The Producers Price Index (PPI) is another fixed weight monthly index. there is a mechanism that collects virtually complete data on income. However. Finally. which are usually released in midsummer. the measured CPI will overstate the inflation rate. etc. The data are then unchanged until complete information for the calendar year from tax and other sources can be used to make revisions. Quarterly estimates of the basic aggregates are prepared by the BEA. notes that the CPI is not a cost of living index. which generates many data that are used to calculate national income.Another issue that influences the CPI is the way statisticians handle new products. then these periods of often rapid price decline are systematically being overlooked. and the initial public releases of the information are carefully watched indicators of the state of the economy. of course. It measures goods and commodities purchased by producers. as additional information becomes available.) decline in price for a period of time after their initial introduction. The “preliminary” estimate is released a month later and the “final” estimate a month after that. Many new products (computers. For the income side of the account. and incorporates new benchmarks from the
15
. A correction to the CPI of this order of magnitude has enormous ramifications for the government budget since about a third of Federal spending (mostly retirement programs) is indexed to changes in the CPI and revenue are affected as well through the indexation of tax brackets. The problem is sometimes so severe that the early data may bear little information about trends that are actually emerging.

5 4. That is. is:
LM( X NX
t
) 4 − 1 * 100.1 (Mar 31) Latest 2. calculated by:
LM( 7196. SAAR) 7147.
t −1
OP Q
Finally. output for the quarter is shown as if it were maintained for a whole year. preliminary and final data for real GDP for some recent quarters. GDP data are usually presented as SAAR or seasonally adjusted at annual rates. The latest data (as of the end of 1996) reflect benchmark revisions and the shift to a “chained” calculation of growth rates.5 (Jan 27) Preliminary 3.5 ) − 1OP * 100 = 2. Thus.4 (June 29) 4. the quarterly data are almost always presented as annual rates. for many discussions the quarterly growth rates are not the best measure of output or inflation trends. Second. First.6 (Mar 1) Final 3.9 (Nov 30) 4. Table 4 shows the advance.8 1995-II 7196. Instead.0 (May 27) 3.5 2. they tell us that if production in the quarter proceeded at the same rate for a whole year then GDP for the year would exceed seven trillion dollars. The revisions in these examples are not unusually large or small. The data shown are growth rates for the quarter.0 (Dec 22) 5.7 (July 29) 3.9 3.8 (Aug 26) 3.0
The numbers do not mean that over $7000 billion of final output was produced in each quarter.4 (Oct 28) 4.economic censuses. say X. 28) 3. the data are almost always shown after seasonal adjustment.5 3. the convention used to calculate the SAAR percentage rate of change in any series. TABLE 4 Rate of Growth of Real GDP (SAAR) and Announcement Dates Advance 94I 94II 94III 94IV Data Presentation There are several conventions that are used when GDP data are presented. The historical data are revised as far back as necessary when the major revision takes place. Here are GDP data for two recent quarters: 1995-I GDP (billions of dollars.8 Q
4
Generally.8 N 7147.6 (Apr.1 (Sept 29) 4. Growth rates can bounce around from quarter to quarter. The growth rate for GDP in 1995-II (the percentage change from the previous period) is also an annualized growth rate. so a broader picture can be obtained
16
. seasonally adjusted at annual rates (SAAR). That is. as explained in the next section. the influence of seasonal variations in activity is removed using the common procedures developed by the Census Bureau to estimate seasonal patterns from past data.

observed every boat entering or leaving the harbor.. Nevertheless. TABLE 5 BALANCE OF PAYMENTS. However. balance of payments data are notoriously difficult to measure. the statisticians are able to chart the international position of the economy.S. the preferred measure of GDP growth in 1995 is the percentage change between GDP in 1995-IV and GDP in 1994-IV. Thins are not so simple these days when goods enter in thousands of sealed containers and money gets transferred electronically. For this purpose.g.S.) Fourth quarter to fourth quarter growth rates provide a good measure of the growth that takes place over the calendar year. analysts would calculate the annual growth rate as the percentage change in total output for the year. assets abroad / Payment for foreign assets purchased Official reserve assets Other -967 -820 -669 -151 -147 -36 -151 -166
5 -131
17
. it is common to examine the growth from the same quarter in the previous year. Thus.S. discussions of GDP growth in the year will use fourth quarter to fourth quarter growth. to pay for imports) is a negative entry. In the good old days. Thus. residents from rest of world (ROW) 852 • Exports 715 Merchandise 502 Services 213 • Income received 137 (Interest.g.from annual growth rates.S.. 1994 CURRENT ACCOUNT Receipts of U. and examined its cargo of goods and money (gold). BALANCE OF PAYMENTS The balance of international payments is an important measure of international economic and financial activity. dividends and reinvested earnings of foreign affiliates of U. for export sales and from income on overseas investments) is a positive entry and a payment made abroad (e. The balance of payments accounts are shown in Table 5 with data for 1994. government statisticians had an easier time—they stood on the dock. (In the past. corporations) Payments to ROW • Imports Merchandise Services • Income paid Net unilateral transfers payments CURRENT ACCOUNT BALANCE (Receipts + Payments + Net transfers) MERCHANDISE TRADE BALANCE CAPITAL ACCOUNT Capital outflow • Increase in U. Furthermore. Receipts of U. residents from abroad (e. it is common to use annual changes or rates of growth.

S. The inability to foresee and plan for all contingencies leads. there are enough similarities to make some general statements about the performance of the economy over the course of a typical cycle. On the capital account a payment for a foreign asset purchased is a negative entry and accumulations of U. Furthermore. / Receipt for U. Since the 1994 current account balance was negative.S.Capital inflow • Increase in Foreign assets in U. assets by foreign residents) should be positive and of the same amount. They do not follow any fixed periodic pattern such as seasonal cycles.) The balance of payments accounts are calculated separately from the NIPA so there are differences between reported current account balances and NFI due to differences in coverage. Business Cycle Defined In a free enterprise economy. and timing. There is simply no way of accounting for all cross-border transactions.S. assets by foreign residents are positive entries. plans and decisions are made independently by a large number of economic agents. the current account balance in 1994 was $ -151 billion while the NIPA estimate of NFI was $ -140 billion. Although each business cycle is unique.(Capital account balance + Current account balance) The current account balance is conceptually the same as net foreign investment in the NIPA. Let us enter the process with an economic expansion getting underway. BUSINESS CYCLES Economists have always followed the periodic changes that occur in level of business activity. each cyclical episode can differ with respect to the duration. From time to time. These fluctuations are called business cycles. Such aggregate fluctuations are called business cycles. definitions. Business cycles are recurring changes in economic activity.S. to an accumulation of imbalances throughout the economy. (What’s $11 billion among friendly government statisticians?) If payments to the rest of world exceed receipts (the current account is in deficit). we will briefly define the term business cycle and describe some of the data that are used to monitor business cycle developments. depth. This reflects the impossibility of the task at hand. Thus. In this section. imbalances between supply and demand will emerge and agents will not always be able to make the necessary adjustments to remove the imbalance. The change in the asset position of the U. and diffusion of the cycle. on occasion. is summarized by the capital account in Table 5. the capital account balance (net purchases of U. then foreigners accumulate assets in the U. Recall from above that NFI = X – M – INF + NR or net foreign investment is net exports plus net income received.S. assets purchased by foreigners Foreign official 39 Other 252 CAPITAL ACCOUNT BALANCE Statistical Discrepancy = . 165
18
.S. (The NIPA presentation above ignored foreign transfers for the sake of simplicity. We see that there is a large discrepancy between the current and capital account balances.

As the expansion goes on. Cycle Dating Business cycles are commonly separated into expansion and contraction or recession phases. plant capacity. Third. and. If the balance of contractionary forces grows the economy will enter a recession. underlying growth expectations. Such responses can go a long way to starting an expansion phase. However. Virtually everyone relies upon the dating or classification of cyclical episodes prepared by the National Bureau of Economic Research. The forces of recession will also be self-reinforcing. most recessions come to an end within a year and before the toll of unemployment has a major impact on the well being of society. a vigorous expansion may lead to a too rapid buildup of inventories and capital goods. The NBER is a private think tank whose Cycle Dating Committee is viewed as the
19
. consumption and investment plans are to a large extent determined by long-run expectations. shortages of key resources might create physical barriers to further expansion. profits are likely to respond quickly. unless the monetary authority accommodates all inflationary pressures. the economy is perched precariously between a slowdown in the expansion and a recession. as capacity is reached. and if a few of them come together. with some lags. contracts and orders for investment goods begin to rise. competitive pressures lead firms to take advantage of the recession to improve efficiency and increase market share. investment expenditures increase as well. Increases in earnings in the expanding sectors will generally lead to increased retail sales throughout the economy. After the peak of economic activity. There are pressures on profits and many firms might be experiencing financial difficulties. First. Fourth. Although there may be pauses in growth due to brief inventory adjustments. At the same time. Second. the expansion is well under way. unemployment will increase. Second. Nevertheless. policy-makers are likely to take action to shorten a recession and this drives expectations. Thus. interest costs and equipment prices are favorable. and the inherent forces that bring a contraction to an end. Third. At this point. Furthermore. Cash flow might be insufficient to service debt incurred during the expansion and the number of bankruptcies is likely to increase. as the expansion eliminates all slack in the economy. costs of production will go up. low interest rates and the ready availability of skilled labor. First. In the early phase of the expansion. The expansion impulse will spread quickly through the economy. Thus. There is a willingness to undertake new activities and the expansion is self-reinforcing. many firms will find their inventories expanding rapidly as demand falls. As a consequence. Once the contraction is clearly underway. At this stage. Finally. profit margins decline and productivity growth slows. the depreciation of capital leads to new investment demand. the expansion is likely to lead to increased interest rates. output can be increased with only small increases in employment. The latter can include the influence of low mortgage interest rates on housing demand. capacity constraints loom in the not-too-distant future and delivery lags begin to lengthen. forces that can generate a recession do appear. GDP quickly surpasses its previous peak and a mood of optimism spreads over the economy. the strength of consumer demand and investor confidence can maintain an expansion for a long period of time. Growth expectations and the mood of optimism may begin to erode. there are a number of forces that make recessions rather short phases.The process of expansion can be fueled by a number of forces including an anti-recessionary macroeconomic policy. material inputs and credit may lead entrepreneurs with underlying confidence in the economy to seize the opportunity and start new projects. foreign demand. the expansion can reach its peak. Home building is often the first sector affected by interest rate pressures. Thus. New orders will expand in all sectors and bring the recession to an end. productivity growth (the growth of output per labor hour) is likely to be rapid.

The start of a recession is called a business cycle peak since it is the peak of the ending expansion. Post war expansions have been typically longer. the recession became almost official when the committee stated that “it appears likely” that the committee will decide that a recession began somewhere between June and September. It was not until December 1992 that the committee concluded that the cycle trough had been in March 1991. The average decline in real Gross Domestic Product (GDP) was 1.7%. The expansion began with many fits and starts and the committee hesitated for some time before reaching the conclusion that the recession had ended.
20
. and the average high for the unemployment rate was 7. ranging from 12 to 106 months. The median length of the post war expansions is 42 months (the mean is 52 months).official arbiter of what constitutes a recession and when it began. In April 1991. ranging in length from 6 to 16 months with a median length of 10 months. There have been 9 recessions in the post-war period. before the recession had ended. the committee announced that the official start of the recession was July 1990. In December 1990.9%. Table 6 shows the dating and some important characteristics of post-war business cycles. and the end of a recession is called the cycle trough.

That is. prices. slower deliveries diffusion index Contracts and orders for plant and equipment. New orders. inventories. credit difficulties. durable goods industries Change in sensitive materials prices Stock prices. The index of coincident indicators consists of aggregate measures of overall economic activity: • • • • Employees on non-agricultural payrolls Personal income less transfer payments in constant dollars Industrial production index Manufacturing and trade sales in 1987 dollars
22
. orders. costs. For example. S&P 500 Money supply.Cycle Indicators Business cycle developments are followed by looking at large numbers of economic indicators that move over the course of a cycle. the Conference Board is publishing regular reports on cyclical indicators and compiles the widely followed indexes of leading. sales. lagging indicators lag the reference cycle turns and coincident indicators (usually measures of aggregate activity) follow the overall cycle. the average workweek will rise or fall before the number of jobs changes. The study of cyclical indicators was introduced in the 1920s by economists at the National Bureau of Economic Research and elsewhere. Of particular interest are the leading cyclical indicators. a measure of economic activity is termed a leading indicator if it has systematically and consistently turned down before the peaks in the reference cycles and turned up before the troughs. contracts and unfilled orders are clearly harbingers of future production. 1987 dollars New private housing units authorized by local building permits Change in manufacturer’s unfilled orders in 1987 dollars. The components of the index are leading series usually because they reflect some intentions or plans for future economic activity. employers initial responses to changes in demand will be to change the hours worked. In the post-war period. lagging and coincident indexes that had been developed by the government. money stock. interest rates. are an initial response to changing economic conditions or are a cause of future activity. The components of the leading indicator index are: • • • • • • • • • • • Average weekly hours. Eleven such series are included in an index of leading indicators which is a widely followed monthly measure of business cycle activity. consumer goods and materials industries Vendor performance. building permits. The real money supply is a measure of the monetary policy stance. M2 in 1987 dollars University of Michigan Index of Consumer Expectations
It is easy to see why these series are likely to lead. Now. investment. The stock market might measure investor confidence and the index of consumer expectations is a survey measure of consumer sentiment and psychology. Similarly. production. a few of the government’s statistical efforts were privatized. manufacturing Average weekly initial claims for unemployment insurance Manufacturer’s new orders in 1987 dollars. the Commerce Department analyzed and published data on the cyclical behavior of hundreds of measures of all types of economic activity—employment. Thus. Cycle indicators are classified by their relationships to the reference cycles. At the end of 1995.

4 B = 50. consider a bond that pays the holder $100 at maturity in N years and also pays the holder annual coupon payments of 100i where i is the coupon interest rate.Finally.06 (1. As the interest rate increases. consider a ten-year zero coupon bond (the promise to pay $100 in ten years time).03 r = .06) (106) 2 . If there are no coupon interest payments—a zero coupon bond (strip or a Treasury bill)—then the relationship is simply: 100 = B (1+ r)N This illustrates the inverse relationship between the bond price—B—and the yield to maturity (market interest rate)—r. r. (which we will call the interest rate on an N year bond) and the price of the bond is:
B=∑
δ =1
N
100 i 100 + δ (1 + r ) (1 + r ) N
where
B i r N
= = = =
price of bond coupon interest rate yield to maturity time to maturity
The yield to maturity is the interest rate that discounts the bonds payments to its price. the value (price) of this promise goes down: r = .8
Now consider a two year bond (N=2).07 B = 100/(1. with a 6% coupon rate that has just been issued at par (B=100).03) 10 = 74. consumer installment credit outstanding to personal income Percentage change in Consumer Price Index for services
INTEREST RATES AND EXCHANGE RATES Interest Rates and the Yield Curve Since interest rates and exchange rates play an important role in all discussions of macroeconomics.
23
. it will be helpful to briefly present some important definitions. To begin.4 B = 61. The yield to maturity is also 6% because:
100 =
6 6 100 + + 2 1.05 r = . the components of the index of lagging indicators are: • • • • • • • Average duration of unemployment in weeks Ratio of manufacturing and trade inventories to sales (in 1987 dollars) Percentage change in index of labor cost per unit of output Average prime interest rate charged by banks Commercial and industrial loans outstanding in 1987 dollars Ratio. The relationship between the yield to maturity. For example.

risk of default). An example illustrates the relationship between the nominal and real rates. r2 . 103 . the purchasing power (in terms of dollars values at the start of the investment period) of the amount returned at the end of the year is:
105 = 10194 . i. We can illustrate the expectations approach to the term structure by considering again a bond with two years to maturity. At the end of one year the bondholder receives $105. or buy a one-year bond with yield to maturity r1 now and reinvest in another one-year bond when it matures. is higher than the one year rate (an upward sloping yield curve). so there is more liquidity. The relationships between yields at different maturities are often explained with the expectations hypothesis .If one year later the price of the bond increases to B = 102. However. Many investors have explicit maturity preferences (preferred habitats). There is more trading activity in shorter-term bonds. if I observe that the two-year rate is 4½% and that the one-year rate is 3¾%.g. shorter-term yields tend to be lower and the yield curve is on average positively sloped: • • • Shorter-term bonds are less subject to price variation when market rates change. The investor does not know what the one year bond yield will be one year from now but the expected one-year yield is Er1 .039 (1 + r )
The yield curve is the relationship between time to maturity (N) and yield to maturity (r) for bonds that have the same characteristics otherwise (e. The expectations hypothesis is simply that the two options are equivalent: (1 + r2 )2 = (1 + r1)(1+Er1 ) If the two year rate.. government bond rates. Say that the inflation rate has been 3%. an upward sloping yield curve implies that investors expect shorter-term rates to increase in the future. For example. As a result. then the expected one year rate is 5¼%. it is often important to think in terms of the increase in purchasing power when holding dollar denominated financial assets—the real rate of interest. The simple expectations hypothesis presented here ignores several important factors that generally make shorter-term bonds more attractive to investors. then the expected one-year rate one year from now is higher than the current one year rate. An investor with a two-year horizon has two options: (i) (ii) buy a two year bond with yield to maturity r2.
Inflation alters the purchasing value of financial assets.
If the investor is indifferent between the two options.
24
.. That is. what is the yield to maturity now? Remember that the coupon rate is still 6% and that now maturity occurs in just one year:
102 =
( 6 + 100) or r = 0. then the expected yield will be equal. In this case. Therefore. the purchasing power of the amount returned is different than its purchasing power at the time the investment was made if there has been any price change during the year. Er1 > r1.S. Consider a one-year bond that is issued at 100 with a coupon interest rate of 5%.e. The expectations hypothesis can be used to infer future short-term rates or expected changes in interest rates from the yield curve. The most common yield curve is for U.

If inflation in Mexico was just
26
1995
. trade that takes place with that country. trade is with Canada and 10% with Japan. For example. Since there is a dollar exchange rate for every currency. It depreciated by almost as much between 1985 and 1989.S. Consider a situation where the dollar appreciates from 4 to 5 Mexican pesos. It has been fairly stable since that time although there have been some large changes in specific bilateral exchange rates in the 1990s. An increase in the nominal exchange rate—appreciation of the dollar—does not necessarily imply that the dollar will buy more foreign goods. but his ability to buy Mexican goods depends on what has happened to the Mexican price level. by over 40% using the trade weighted exchange rate.S.8 0. Nom
Germany
Japan
UK
If the exchange rate increases.2
0
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
Canada
Trd.8 1. it is useful to have a single measure of the dollar exchange rate.2
1
0.4
1. The American visitor can buy 25% more pesos with each dollar. a dollar purchases more units of foreign currency and the dollar has appreciated in value. APPRECIATION e ↑ DEPRECIATION e ↓ Figure 3 shows that the dollar appreciated from 1980 to 1985.6
1.4
0. if 20% of U.The interesting thing about exchange rates is that they change a great deal and that they do not change together.
Figure 3 Exchange Rate—Units of Foreign Currency per $ (1973=1)
2
1. It is common to use an index of exchange rates for the dollar where every individual exchange rate is weighted by the proportion of U. then the trade weighted exchange rate Index assigns corresponding weights to the Canadian dollar and Yen exchange rates. The exchange rates for the dollar against several major currencies are shown in Figure 3. Table 7 illustrates the magnitude and variability of exchange rate changes over the last 20 years. The trade weighted exchange rate for the dollar is also shown in Figure 3.6
0. Wt.

Figure 4 shows the trade-weighted nominal and real exchange rate for the dollar since 1973. Say that a price of an auto is $2000 in the U.S. the exchange rate for the Mexican peso. Consider some examples.S. auto prices increase so P = 2000 and Pforeign = 6000.
27
. However. Also. there is a real appreciation of the dollar. The real exchange rate is ereal = 1. The real exchange rate is defined as: ereal = e nominal
P Pforeign
where P is the domestic and Pforeign is the foreign price level. It is interesting to note that all of the major fluctuations in the nominal exchange rate are mirrored by changes in the real exchange rate. That is. for example. (P=2000) and 3000 Swiss Francs in Switzerland (Pforeign=3000SFr) in Switzerland. An example will illustrate the definition. If we take the rate of change of the definition of the real exchange rate. then ereal = 1. If we examine. For this reason. and Switzerland. aggregate exchange rates movements are not closely related to inflation differentials. The real exchange rate is unchanged because prices and the exchange rate have all changed by the same proportion. if e = 3 and the ratio of prices remains the same then ereal goes up.0 because prices are the ‘same’ in the U. we need to introduce the concept of the real exchange rate . The story would be somewhat different for bilateral exchange rates. the nominal exchange rate (SFr per dollar) is enominal = 1. • • If the domestic inflation rate exceeds the foreign inflation rate AND the nominal exchange rate is unchanged → the real exchange rate appreciates. there has been no real change in what the dollar can buy in Mexico. If e increases (the dollar appreciates) to 3.25%. If the domestic inflation rate exceeds the foreign inflation rate AND the real exchange rate is unchanged → the nominal exchange rate depreciates. the nominal exchange rate changes in order to offset the inflation differential and the real exchange rate is less volatile than the nominal exchange rate.5 which means that the auto costs the same in both countries. we have: %∆ereal = %∆enominal + %∆ P – %∆ P foreign The real exchange rate changes when nominal exchange rate changes do not offset the differential between the domestic and foreign inflation rates. ALSO.0 AND.

PRODUCTIVITY AND LONG-RUN EQUILIBRIUM An examination of the wealth of nations reveals two facts—one well known and one little known.S.850 13. Even when PPPs are used to make GNP in different countries comparable in terms of purchasing power.780 2.
$24. Some countries are very wealthy and some are very poor.S. GDP per capita was almost $25.630 6. The comparison of incomes in different countries is sometimes a complicated matter. The goods and services produced in different countries should be valued consistently so that the differences in GNP reflect real differences in the volume of production.850 19.
29
. In 1965.050 5.490) and Switzerland ($35.050 4. 1995.220
PPP calculations for long periods of time are not readily available. so to see how relative income positions have changed over time.740 20. twenty-five years later the ratio was less than 5. When GNP per capita is converted to dollars using the exchange rates. was 17 times larger than that in Korea.S. real GDP per capita in the U. The well-known fact is that there are enormous differences in the value of output per capita as we travel around the world.000 16. The comparison is misleading because prices in Japan and Switzerland are much higher than comparable prices in the U. The less well-known fact is that the relative position of different countries can change dramatically over relatively short periods of time.510 19.370 5. A better comparison is made when GNP is converted to dollars with purchasing power parities instead of exchange rates.CHAPTER II GROWTH. World Development Report. which is about fourteen times larger than GDP per capita in China.000 in the United States.100 3.330 1. ($24. we will look at the growth of real GDP per capita from 1965 to 1989. we find that in 1993 GNP per capita in Japan ($31. PPP conversions show how many units of currency are needed in one country to buy the same amount of goods and services which one currency unit will buy in the other country.740).760) are much higher than the level in the U.510 9. In 1993. there are enormous differences in per capita real output around the world: GNP Per capita in 1993 on a PPP Basis United Sates Japan Singapore France Germany Spain Korea Hungary Brazil Russia Bulgaria Egypt China India
Source: World Bank.

Why do countries grow? This is a simple question with a complex and controversial answer. they determine the relative wealth of nations. the labor force grew rapidly from both population growth and the increased participation of the population in the active labor force. Differences in growth rates make significant differences in just one generation. Korea and the Philippines were undeveloped economies with real GDP less than 10 per cent of that in the U. as well as trade and industrial policies. such as: • Macroeconomic policy—monetary and fiscal policy.). Social and cultural attitudes can also effect the ability of a given economy to exploit the available resource base.2% 7. However. Nevertheless. First and foremost. the sustained rapid growth in these countries suggests that something else was going on as well. Rapid growth can occur in economies (e.g. Finally. Korea) which start with little physical infrastructure and the ability to improve quality of human capital through education. the growth rate of the capital stock was very rapid. look at Brazil and Korea.0% 0. By 1989.8% 1. two small countries with the same levels of real per capita GDP in 1965. Political stability and a legal structure that securely defines and protects property rights are essential to the development of a growth-oriented environment.
• •
The controversy emerges when we examine countries that have experienced unusual growth spurts. Nevertheless. In addition. technology transfers and foreign investment will lead to convergence among developed economies (e.S. Second. growth rates matter.S.5% 1. few observers would attribute a generation of rapid growth to the success of
30
. it was the government direction of resources to key industries. Thus. because of a growth rate in Korea that was twice as large. Another interesting comparison is between Uruguay and Singapore. growth is due to the increased availability of the resources or the inputs into the production process—capital and labor. Sustained growth in Korea has led to a situation where real per capita GDP in 1989 was over 20 per cent of the American level while slow growth in the Philippines means that the ratio is less than 5 per cent of the American level.0% 3. real GDP in Korea was bigger than that in Brazil by three-quarters. Germany and the U. there are a number of other issues that might effect the growth process. may or may not create a growth oriented environment.. Perhaps.. By 1989.GDP Per capita. Is their rapid growth simply due to an increase in available capital and labor resources? These countries have high savings rates and started with a very small capital base in the 1960’s. such as Singapore and Korea in the above table—two Asian tigers.6%
In 1965.g.6% 7. growth is due to improvements in the technology of production which will take place from both the transfer of technology from country to country and the development of new technology and the fruits of invention.7% 1. Singapore’s real per capita output was almost four times larger than Uruguay. real GDP was almost over one-fourth larger in Brazil in 1965. Similarly. Similarly. $ China Philippines Korea Brazil Uruguay Singapore New Zealand United States 1965 88 477 811 1075 1944 1925 9890 14060 1989 350 710 4400 2540 2620 10450 12070 20910 Average annual growth rate 5. this includes the openness of the economy to trade and competition that helps it utilize its resources to maximum advantage.

ANALYZING GROWTH The analysis of the sources of economic growth starts with the production function: Y = A * F (K. perhaps there are growth synergies that enable expanding economies to learn from their growth experience and rapidly increase their ability to use resources. the growth rate in output on the left and on the right side substitute α K and α N as defined above:
dY dK 1 dN 1 1 dA = αK + αN + Ydt dt K dt N A dt ∆Y ∆K ∆N ∆A = αK +αN + Y K N A
31
. an oil embargo) that inhibit production. the impact of government regulation. the whole production frontier increases or shifts out as the level of technology. inputs. for example. Y. supply shocks (e. The production function can be rewritten to show how the growth rate of output depends on the growth rates of the inputs. This endogenous growth phenomenon—that growth feeds on itself and teaches the economy to grow some more—is difficult to understand but surely plays a role in the sustained growth spurts which we see in some countries. then miserable economic growth record would not have led to the disappearance of communist regimes throughout Europe and Asia. the diffusion of technological progress and the synergies that create growth rates (see above). N) The level of output (really the potential or the natural rate of output. and labor N. take the derivative of the production function with respect to time:
dY dF ( K. A may shift in the short-run to reflect shocks to the production process from. increases. Growth in A reflects the ability to produce more with a given level of inputs because of improvements in production technique and knowledge. N ) dt ∂K dt ∂N dt dt
Now.government planning processes. In addition. by Y. is a function of capital. since it is assumed that all resources are in fact utilized). improved management. storms).. the weather (droughts. K. Instead.g. A. yielding (dY/dt) / Y. To show this. If government planners could generate rapid growth. define the elasticities of Y with respect to K and N respectively as:
αK = αN =
dY K ∂F K =A dK Y ∂K Y dY N ∂F N =A dN Y ∂N Y
Divide each term on both sides of the last equation for dY/dt. N ) dt dt dt dY ∂F dK ∂F dN dA =A +A + F( K. Furthermore. N ) dA =A + F ( K.

then the total return to the owners of capital is cK and the total return to labor is (w/p)N. we can rewrite the growth equation and the definition of labor productivity growth becomes: Assume α K + α N = 1
∆Y ∆N − Y N
(
∆Y ∆N ∆K ∆N ∆A − ) = α K( − )+ Y N K N A
This equation shows that labor productivity growth can be attributed to two causes: • technological progress
∆A A
•
capital deepening
∆K ∆N − K N
Capital deepening is the rate of growth of capital per unit of labor input (rate of growth of K/N). It is used to determine to what extent growth can be attributed to growth in the capital stock. or that part of output growth which is not explained by the growth in the factors of production. α N is wage and salary payments as a proportion of total income and α K is the returns to capital (profits. Total Factor Productivity Growth =
∆A A
A yet more important concept is the rate of growth of labor productivity or the percentage change in output per unit of labor (which is the rate of growth of output less the rate of growth of labor inputs): Labor Productivity Growth =
Note that if the elasticities sum to one. is equal to the marginal product of labor and that the return on capital.The above equation for the decomposition of output growth is the framework for analyzing the sources of growth. K N
The residual. it is easy to see that the elasticities are the total factor returns as shares of output:
αK =
cK Y
w ( )N p αN = Y
Specifically. and growth in labor inputs. It is the extent to which both the capital and labor inputs are becoming more useful in production. etc. ( ). c. If capital and labor are paid their marginal products. each worker can increase his or her production because the amount of capital available is growing. rents. Finally. Recall that in a competitive economy the real wage. There is an additional interpretation of the weights or elasticities in the equation for the decomposition of output growth. ∆A / A . w/p.) as a proportion of total income. When the capital-labor ratio is increasing. is the marginal product of capital.
32
. by substituting for the marginal products in the definitions of the elasticities. is called technological progress or total factor productivity growth. (
∆K ∆N ) .

g.S. Although labor’s share does vary cyclically. From 1950 to 1969. deep recessions in 1981–82 and 1990–91. Thus. To see this. the result will be inflation rather than real wage growth. it has remained quite constant for long periods of time (except for changes due to increases in the size of the government sector). hours worked) is the primary source of growth in real wages. Since that time.S. Although the slowdown is most pronounced in the U. that figure has only been exceeded in three years. labor productivity growth in the U. the growth of real output per unit of labor input (e... Productivity Trends A major problem of the post-war era is that the average. if nominal wages increase more rapidly than productivity (with labor’s share constant). Thus. grew at a rate that was more than twice the average rate for the next quarter century. The real wage can only increase when technological improvements or increases in the capital stock augment labor productivity.2 per cent per year.
33
. Table 1 shows OECD (Organization for Economic Cooperation and Development) estimates of trend rates of labor productivity growth (with estimates of the cyclical influence removed).11 1. The productivity growth slowdown is not restricted to the U. it occurred in all the major economies. However. An important point can be brought out by remembering that real wage growth is nominal wage growth less inflation. business sector averaged 3. the following data for the average rate of growth of labor force productivity for the non-farm business sector shows that the slowdown has persisted for over two decades: 1960–73 1974–81 1982–90 1991–95 2. The productivity growth slowdown started in the early 1970s and many economists originally thought that it was principally a temporary phenomenon associated with the supply shocks of the 1970s—the 1973 and 1979 oil shocks.S. the inflationary shocks from the agricultural sector. productivity growth is the source of wage growth. look at the labor share definition of α N in rate of growth terms and rearrange:
∆
w ∆Y ∆N p ∆α N = +( − ) w αN Y N p
∆
w p ∆w ∆p = − w w p p
Real wages can grow only when there is labor productivity growth or labor’s share of product increases.85% 0. rate of labor productivity growth has declined.S. A number of things contributed to this slowdown such as the increased share of service industries in the economy (which have notoriously low and often mismeasured rats of productivity growth) and the maturing of the manufacturing sector which reduced the contributions of new inventors and discoveries. or trend.07
The exceptional experience for productivity growth is apparently the first 25 years after the Second World War when productivity in the U. PRODUCTIVITY Labor productivity growth.94 1.Output growth is a weighted average of growth in the capital and labor inputs where the weights are the proportions of national income which are paid to the respective factors of production plus the rate of technological progress.

1993
The decline in the productivity growth rate has serious implications.9 1. if we underestimate
For example.5 2.7
34
. Sources of Economic Growth There are empirical studies that decompose the growth of output into its various sources. K N A
∆A ∆Y ∆N ∆K = −αN − (1 − α N ) A Y N K
To illustrate.9 2.0 3. their expectations of wage gains generate inflationary pressures and a failure to realize such expectations contributed to the economic malaise of recent times.5 2. we can attribute the observed growth of real product into portions due to capital and labor inputs.6 1987–92 0.67)1.0 1980–86 0. Given the capital and labor shares. It means that real-wage growth is necessarily less than it was a generation ago. better yet. Individuals who have entered the work force in the postVietnam era experience smaller real-wage gains than did their parents in the post-World War II era.S. Thus.K. measurement of total factor productivity growth is somewhat sensitive to the measures of K and N used. Data are shown for each of the postwar decades—the 50’s to 80’s. Nevertheless.8 1. Moreover. most studies suggest that the contribution of total factor productivity to output growth is substantial. then might be very large. the calculation for the first subperiod is: 1.5 3.3 1974–79 0. Thus.3 4. That is. hours corrected for the level of education of individuals in the labor force (the quality of the labor input). The table starts with the average annual growth rate in non-farm business output and the growth of the net stock of fixed capital hours worked. Total factor productivity is the residual or that portion of output growth not explained by growth of the inputs. they expect their real wages to grow from year to year.4 3.1 2.8
Source: OECD US Economic Survey.9 1.0 8. their expectations are likely to be that their experiences should match that of their parents. Total factor productivity is derived as the residual from:
∆K ∆N ∆A and . 2.0 – (0.67)3. the labor input can be a simple count of hours worked or.3 – (1 – 0. Table 2 presents a breakdown of the sources of economic growth in the United States since World War II. Japan Germany U. However.9 = 4.TABLE 1 Trend Growth in Labor Productivity (Business Sector) in Percent per Year Early ‘60s–1973 U.

74
Average annual percentage changes for Private non-farm business sector in 1982 $ Sources : OECD Economic Survey of the U.
35
. the increasing educational level of the work force increases the productivity of each hour of labor input. as well as advances in knowledge.2 0.7 1.7 2.74 1990–93 1.8 0.7 1. Economic Report of President.5 3. To a large extent this might be a result of the effects of the two large recessions in the period and the changes in energy prices. roads. First.4 0.1 1.g. airports) that is not included in the private capital stock was substantial in the 1950s and 60’s when there was significant infrastructure investments by the public sector.9 .3 1.4 1.7 1.2 4. the productive contribution of government owned capital (e. The residual includes the effect of improvements in the quality and allocation of inputs. The post-war and post-depression era allowed for unusually high levels of productivity growth for almost 20 years.6 0. Since the mid1970s productivity growth had declined even further.0 0.0 0..2 2.4 2.0 4.6 0.67 1970–79 3.4 1.73 1980–89 2.4 . but by no means. On the other hand. Citibase
Total factor productivity growth is that part of output growth which is not accounted for by growth in capital and labor inputs.0 0.0 3. It can also be viewed as the rate at which the production functions shift out or the rate of technological progress.. even while the capital stock was growing rapidly. The table also includes some estimates of the contributions towards total factor productivity growth from two important sources. all of the slowdown in total factor productivity growth. The slowdown in the growth of labor productivity is of particular interest.Table 2 Growth in the U.8 0. Economy 1950–59 Output ∆Y/Y Capital ∆K/K Labor hours ∆N/N Total Factor Productivity ∆A/A • Due to government capital • Due to education Labor Productivity Capital Deepening Labor share α N 4.5 3.4 0.67 1960–69 4.5 2. It is of serious proportions.4 1.5 . 1991–2.5 -0.1 2. it is possible that there has been a decline in the rate of technological improvements.7 .S.0 1.6 0.5 0. It is quite large in the first two decades where it accounts for almost half of total growth. 1995.4 1.S.9 3. The slowdown started in the 1960s. Second. It should also be noted that the early post-war period was an atypical experience.6 . Changes in both of these factors explain part.9 0.

∆A . In the middle subperiod. The key to understanding the productivity slowdown is then the growth of total factor productivity. is likely to have only a small effect on productivity growth. Moreover. labor productivity growth would have been modest. is almost $10. Thus tax policy.6 + 0. large changes in investment have only a small effect on the capital stock in the short-run. This can occur when new capital equipment embodies new technology and the new technology has benefits to society that extend beyond the capital. the rate of growth of the capital stock slowed down considerably. Suppose that percent. Capital deepening has also declined. Thus. Table 3 summarizes historical studies by John Kendrick and Edward Denison on the sources of growth for the whole economy. then the calculation of labor productivity growth would be: 0. it is also important to mention that episodes of rapid growth are often characterized by both capital deepening and rapid total factor productivity growth.
36
. is due to a slowdown in advances in knowledge. according to Kendrick’s calculations. This is an illustration of endogenous or self-expanding growth as new technology effects exiting production processes and growth takes off. changes in the capital stock are always gradual. – 1. which promotes K
The value of the capital stock (K) in the U. the decline in total factor productivity growth is due to structural and demographic changes in the economy.8) = 1. α K = 0. This can be seen from the identity that relates investment to the capital stock: Kt = Kt-1 + It – Depreciation
∆K has a small weight.How to Increase Productivity Growth We showed above that the two sources of growth in labor productivity are capital deepening and technological progress. However. Less than a third of the post-war decline in ∆A/A. capital deepening was less than it was earlier. An interesting conjecture would be to calculate what labor productivity growth would have been in the 1980s if the capital stock had grown as rapidly as it had in earlier decades. because even though the capital stock grew rapidly. A
We will look at some of the standard explanations found in the historical studies. The reason for this is that
∆K = 4.26.S. there was a large increase in the rate of growth of labor. Endogenous growth phenomena help explain the remarkable growth spurts of some Asian countries in particular that we noted at the start of our discussion.26 (4. In the last subperiod.000 billion while gross investment (I) in 1993 was around $900 billion.4 K
investment. The synergy between new and existing technology implies that we may all learn from new technology although it is only directly used in certain activities.4. To a large extent. The above data indicate that the rate of technological progress since the mid1960s is only about half as large as it was in the first two post-war decades.3 Even with exceptionally rapid capital stock growth.

1 0. The economy is composed of different types of economic activity with different levels of productivity. the rate of growth of labor quality has contributed to total factor productivity for over 50 years.TABLE 3 Sources of Total Factor Productivity Growth 1929–1948 ∆A/A Labor quality Age-sex composition Resource reallocations Volume of production Impact of government Advances in knowledge Other 2. The increase of output per unit input was simply a consequence of the reallocation.3 0. The sources of this growth category are the steady improvement in the level of education of the labor force and the health of workers (i. it is possible that productivity growth in the service sector will rival that of manufacturing in
37
.9 -0. particularly after the mid-1960s.1 1948–1966 2.6 0. One source of productivity growth over time is the movement of economic resources from parts of the economy with relatively low productivity to parts where there is high productivity.0 0. In the government and the financial services sectors (both of which have grown rapidly—government in the 1960s and 70s and financial services more recently).1 -0. This occurred because there was rapid growth in the labor force in that period as the baby boom generation entered the labor force and female labor force participation increased.0 1. Of course. Second.2 -0.1 0. this phenomenon is reversing itself as the growth of new entrants slows and the baby boomers gain work experience.4 0.2 0. output is measured by the size of the labor input so productivity is often assumed away.8 -0. These new entrants were inexperienced. This is a consequence of prosperity.4 0.3 -0. Another kind of resource allocation is related to the growing importance of the service sector.8 -0. because there is only a small part of the labor force left on the farm and labor productivity in agriculture is now very high. However. One problem with understanding trends in productivity growth is that service sector productivity is difficult to measure.8 0. This started at least 100 years ago with the movement of the labor force off the farm to the manufacturing sector. The reversal may well boost productivity growth throughout the 1980s and 1990s. changes in the age-sex composition of the labor force has hindered productivity growth in the post-war period.4 0.4 1966–1973 1. Furthermore.e. It is probable that our current measures understate productivity in that sector. we can afford to have a larger fraction of our labor force working in the service sector.8 0. low paid.8 0.7 1973–1978 0. such a situation dilutes the productivity growth taking place in the manufacturing sector..8 0.4 -0.7 0. We cannot expect this particular movement to be a continued source of productivity growth. and generally less productive than older members of the labor force.7 -0.3 0. wherein there has been less rapid productivity growth. the decline in days lost owing to ill health).4 0.7 -0.1 -0.6
To begin.1 1.

Alternatively. which promotes productivity. None of these would be much affected by changes in capital formation policy. The model will have the following components:
38
.) has begun to gradually lessen.g. banking.. the decline in productivity growth in the post-war period can be largely attributed to resource allocations. government regulation (e. Since the standard capital stock data does not include government capital (e. it could be a result of a reduction in the resources devoted to developing new technology. the government provides services to the business sector. The impact of government on productivity growth is twofold. is the residual effect... This could be because there are simply fewer opportunities for technological progress in the contemporary economy. The baby boom generation is now passing into its prime working years. and the cyclical problems of the past decade. and air transport increases competitive incentives to innovate and increase productivity. This is likely to occur because some of the factors that have had a negative impact on productivity growth are going to be reversed. costs of environmental regulation) have a negative effect on measured productivity. There is good reason to support the belief that the productivity growth slump will end. the costs of maintaining the quality of life (e. the proportion of GDP devoted to research and development expenditures started to decline in the 1960s. technological progress. Particularly in the last subperiod. Thus. 5. etc. pollution abatement equipment).). the burden of complying with government social regulation (anti-pollution. The efficiency of resource use varies over the business cycle.
The relationship between investment and growth in potential output is often complex. Deregulation of industries such as telecommunications.. upgrade the technology of exiting capital. For example.g. clean air and water is not measured as output) and thus reduces productivity growth. etc. 2. MODEL OF LONG-RUN EQUILIBRIUM We now turn to the development of a model of long-run macroeconomic equilibrium. where added experience will aid productivity growth. the contribution of such capital to productivity growth is not measured. Research and development expenditures as a percentage of GDP have risen from the lows of the late 1970s.. The net impact of government was virtually zero until the mid-1960s. Second. For example: 1. or that part of
has been substantial decline in progress since the early post-war period. Tax changes have reduced the taxation of business income and spurred capital expenditures.
∆A not otherwise explained. pollution controls) uses resources without increasing measured output (e. which includes a major recession. 3. There A
Thus. This can be seen if we consider that a given investment expenditure may have one or more of several purposes: it may replace existing capital. the impact of government policies.g. productivity growth was reduced by volume effects. Thus.g. Finally. the long-run productivity effects of the spread of PCs throughout industry has yet to be measured. or augment the productive capital stock. be a “non-productive” addition to capital (e. First. Similarly. the position in the business cycle affects the measured rate of growth of productivity. 4. school buildings. health. bridges. when increased business regulation began to have a considerable negative effect. The expansion increased capacity utilization. For example.the future when the service sector begins to utilize new technologies.g. Inefficient use of resources emerges when there is a lot of excess capacity. which generally leads to economies of scale and more efficient production.

A monetary sector that relates the money stock to the price level. we will take the level of technology (A) and the capital stock (K) to be given. Figure 1 shows the production function for a given level of technology A and the capital stock.N)—can be used to derive the long-run equilibrium level of output.• • • •
The equilibrium level of output which is determined by the production function and the labor market.
Output Equilibrium The production function—Y = AF (K. If the level of technology or the capital stock increases. The equilibrium level of output then depends on the size of the labor input into production.N)
N
39
. It shows that equilibrium or potential output increases with N and that there are diminishing returns to additional labor inputs. A distribution model that shows how the equilibrium output is divided between consumption goods and investment goods. The labor input is determined by a labor market equilibrium. This production function can be used to derive the marginal product of labor as shown in Figure 2 where MPN stands for the marginal physical product of labor (the increment to output from an additional unit of labor).
Figure 1 Production Function
Y
Y= AF (K. The supply and demand for labor determine the equilibrium real wage and the level of employment. This part of the model explains the determination of the real interest rate and also the level of investment. An international or open economy sector that relates the equilibrium to exchange rates. To begin. then the production function in Figure 1 shifts upwards. K.

The empirical evidence on labor supply indicates that there is a small positive effect of real wages on labor supply and thus we draw the supply function with a positive slope.Figure 2 Marginal Product of Labor
MPN
MPN=W/P
N
Profit maximization dictates that the firm should hire labor until the value of the incremental output (P*MPN) equals the wage cost (w). an increase in the real wage may lead to an increase in leisure. (
W ) * . are shown in Figure 3. N*. the MPN P
The labor demand curve is shown in Figure 3. Thus. and the equilibrium real wage. The labor demand curve will shift out if A increases which will increase MPN for all levels of N. Thus.
W .
curve tells us the profit-maximizing amount of labor demanded. along with a labor supply curve. decrease their work hours as the real wage increases. It is possible that individuals will do just the opposite. the equilibrium level of labor. P
Figure 3 Labor Market Equilibrium
NS
(W/P)*
ND
N*
N
40
. The labor demand by firms for any real wage will be the amount that equates the real wage. indicating that an increase in real wages leads to a greater supply of labor hours. Finally. The labor supply curve is drawn with a positive slope. A higher real wage rate means that an individual can attain a target income with fewer hours of work. for any given real wage. to the marginal product of labor.

. In the U. returning to the production function. If the costs of job search are reduced by better job training or improved placement services. a substantial incentive to stay unemployed and to keep job searching at a very leisurely pace. but by no means all. then the time spent searching would fall and the natural rate of unemployment would be lower. Labor market equilibrium Demand for labor Marginal product of labor = real wage MPN = W/P Supply of labor
⇒
2. in Holland. The labor market equilibrium determines N* and the level of technology and the capital stock are given. Thus.
Equilibrium Labor hours N* and real wage (W/P)*
Production Function Y = A F (K.) lead to a natural rate of unemployment which is currently estimated at approximately a five percent unemployment rate in the U. and perhaps as much as 8 percent in Western Europe. which separated the level of output into its components: Y = C + I + G + (X – M) and also derived the investment-saving identity: I + NFI = PS + BS + GS Combine personal and business saving into private saving and reorganize the identity to: Private savings = I – GS + NFI
41
. Differences in the incentive to stay unemployed can explain part. we introduced the NIPA identity. of the international differences in unemployment rates. SUMMARY The initial elements of the long-run macro equilibrium are: 1. unemployment benefits provide about one-third of average wage for one-half of a year. Time spent in normal job search activities and movements in and out of the labor force (by school leavers. Y*. unemployment benefits provide about three-quarters of the average wage for three years. persons involved in housekeeping.S. which results in a higher natural rate.Equilibrium in the labor market does not mean that there is no unemployment.S. etc. we can determine the equilibrium level of output. By contrast.N) ⇒ Long-run Equilibrium or Potential or Natural Output – Y*
Distribution of Output and Interest Rates Recall that in Chapter I. This natural rate may well be unsatisfactorily high and we can consider why this is the case and what may be done to reduce it.

1 The demand for investment goods decreases with real interest rates. the demand for investment is a decreasing function of real interest rates. shows the relationships between the real interest rate and both the demand for finance (investment) and the supply of finance or savings. Generally.
42
. Private savings depends on: (i) (ii) (iii) (iv) disposable income.. Our distribution model examines the adjustment process in the market for investment and savings—the demand for investment goods and the supply of savings—that keeps the savings and investment equal. Thus. current and future income.g. there will be unanticipated accumulation of investment goods (e. as the real return to saving increases.g. which represent the cost of financing investment expenditures or. then a higher rate of interest makes it easier to attain the target in the future and current saving may decline. In each case the function is drawn for a given level of the output equilibrium.
1
The effect of real interest rates on savings can also be negative. future income and taxes. The flow of private saving increases with real interest rates. We begin by looking at the determinants of savings and investment. empirical evidence indicates that there is some positive interest elasticity of saving. we are taking the level of the government saving and net foreign investment as given in this discussion. That is. the opportunity cost of holding physical capital. and real interest rates.
Investment is determined by: (i) (ii) (iii) the productivity of the capital stock. inventories) or unanticipated savings or dissavings. However. If anticipated flows of income and goods do not result in a balance. Y*. Alternatively. In addition. and the real rate of interest. wealth.From a NIPA perspective. thus the supply of savings is a increasing function of real interest rates. individuals and businesses will defer consumption and save more of their current income. Figure 4. The other determinants of investment and saving are held constant as well. if the flows do not balance. there will be adjustments in the markets for investment and savings flows that lead to an adjustment process. savings and investment decisions are quite different. alternatively.
The market mechanism that keeps anticipated savings and investment in balance is the adjustment of the real rate of interest. If individuals save in order to attain some future wealth target (e. The flow of private savings and the demand for investment financing through the financial markets determines the level of real interest rates —rreal—and keep investment and saving in balance. for retirement or in order to purchase a car or a house). this is an identity that must always hold.

GS. In the new equilibrium. Figure 5 also shows the investment schedule (I) without the government saving and foreign investment parts. the level of investment is indicated by E and in the new equilibrium it falls to F. We will examine one extremely important change: The long-run effect of an increase in the government deficit on interest rates and output Consider an increase in government expenditure that increases the deficit. In the initial equilibrium.
Figure 5 Effect of An Increase in the Government Deficit
Private Saving rreal
F B E A D C
I-GS+NFI
I
$
43
. declines and the investment schedule (I – GS+NFI) shifts out to the right. interest rates and the distribution of Y* between consumption and investment goods. Figure 5 shows that Government saving. less investment and a higher real rate of interest. The investment-saving equilibrium shifts from A to B in figure 5 and the real rate of interest increases. there is more private saving.Figure 4 Equilibrium Real Interest Rate
rreal
Private Saving
I-GS+NFI
$
The savings and investment schedules in Figure 4 will shift when any of the other determinants of saving and investment change. Such a change will alter the investment saving equilibrium.

few observers are confident that the government’s activities have the same growth potential as private investment. International capital flows lead through arbitrage to a common world real interest rate in both countries.S. Thus. in a nutshell.
44
. bonds and its net foreign investment. Consider a situation where there are two countries in the world (call them the U.S. increases.S. and Japan) and the capital flows freely around from country to country. When the government deficit increases in the U. AD. The government deficit reduced capital accumulation and the long-run potential growth rate for the economy is reduced as well. In the new equilibrium. is the problem with government deficits sustained for any period of time—they have long-run consequences for growth.S.This example is important because the increased government deficit crowds out investment. The increase in real interest rates creates a current account surplus in Japan. and Japan are initially established at the same real interest rates. This. private saving at the higher real rate exceeds I – GS+NFI. NFI.1 The relationship between an increase in the government deficit and the current account in the balance of payments is shown in Figure 6. the economy is accumulating fewer investment goods and the capital stock will not be growing as quickly. the I – GS+NFI curve shifts out because GS falls. Thus.S. However.
Figure 6 Effect of a Government Deficit
US r real Private Saving
Japan
Private Saving
I-GS+NFI
I-GS+NFI
1
It is possible that the increase in government expenditures will be devoted to productivity enhancing activities like research and development or the infrastructure of the economy. These changes have significant long-run implications because the increased government deficit has reduced the amount of investment. the deficit is crowding out private investment expenditure—some of Y* is being shifted from investment goods to government goods and services. The deficit increases by AC in Figure 5 and the total investment and saving increases by a smaller amount. the investmentsavings equilibria in both the U. The Japanese economy finances the U. deficit through purchases of U.

It is only recently that paper money that is not convertible into a precious metal has been widely used. and so on. We define money and examine the monetary sector equilibrium.
The Fisher relation that relates the real rate of interest to the nominal rate was explained in Chapter I: Nominal rate = real rate + inflation ⇒ Nominal interest rate inom = rreal + %∆P
Money and Prices The next part of the model is the financial sector that relates the money stock to the price level. money consisted of gold and silver coins. it is often difficult to implement it specifically. Next. the farmer would need to find someone who had the type of parts that fit her tractor and who wanted exactly the produce the farmer offered. the money unit of account (e. Money is then whatever is accepted and used for transactions. rather than in terms of its physical attributes.g. they would need to resort to barter. Imagine the difficulties involved with living in a society without money. or yen) provides a common reference unit for quoting prices (called a numeraire).3. holdings of money represent a store of value because they can always be exchanged for goods. It is best to define money in terms of the roles that it plays in economic society.
45
. Many objects have served various societies as money (including wampum and even cigarettes). in the modern world the role of money is often played by computer entries that need never take on any tangible form. If people could not use money in exchange for goods and services.. Money is the stock of assets used to conduct transactions. However. even to a toddler who has not problem recognizing bills and coins—currency. In the classical world. This transactions role of money is extremely important. Paper money that was convertible into specie dates to the seventeenth century. In addition money has changed its physical characteristics over time. We will begin by introducing an asset called money. Although there is general agreement about this conceptual definition. this definition is much too restrictive. In addition. franc. Furthermore. dollar. A farmer would need to take her produce and find a cloth maker who not only had the type of cloth the farmer needed for her clothing but who also wanted the kind of produce the farmer had to sell. That is. What is money? The answer is obvious.
Distribution Model Private Saving = I – GS + NFI ⇒ Equilibrium real interest rate rreal
4. The time and effort expended would be enormous. People use money for purchases and sales of goods and services. Finally. they would need to exchange goods and services directly. The most important function of money is that it act as a medium of exchange.

A summary of the formal definitions of the money supply is presented in Table 4. In addition to the three definitions of the money supply in common use. In addition. M1. It acts as a standard of value. it is the unit in which prices are expressed. in the U. consists of coins. and checkable deposits. If we hold money. The narrowly defined money stock. and some Eurodollar deposits held by U. Coins and currency (paper money) are clearly used for transactions and should be included in even the most narrow measure of money. There are measures of the money supply that are still broader than M2. effort and resources afforded by the use of a uniform money for all transactions provides a great benefit to society. Money also serves two other functions. It would be enormously difficult to keep track of prices in the absence of a common reference unit. What then. demand deposits. It is no wonder that one of the principal goals of government is to see to it that society has a viable money asset. These measures include financial instruments that are somewhat less easy to use for transactions than are the instruments in M2. In fact. M3 includes all items in M2 along with time deposits in excess of $100. money market mutual funds (MMMF) and overnight repurchase agreements. The broader definitions M2 and M3 include other financial assets that can be used for transactions with minimum difficulty or can be readily converted into a transaction asset. M2 includes savings deposits (including money market deposit accounts—MMDA). In the United States. money can also act as a store of value. M2. L (for liquidity) and total debt. consists of the assets which are most clearly held for transactions purposes. it is not often easy to draw a hard-and-fast line between money and other financial assets. Finally. The narrow definition M1.000 term repurchase agreements. checkable deposits (deposits at banks and other financial institutions that are subject to payment upon demand) are used and accepted for most transactions.
46
. residents.S. the Federal Reserve also prepares and monitors two broadly defined money aggregates. we are able to transfer our purchasing power over time. in addition to coins. includes all of the items in M1 and some instruments that are very easily converted into a transactions balance or can themselves be used for transactions with some restrictions.S. the Federal Reserve Board provides several formal definitions for the money stock.000) with a specific maturity. are the assets in our economy that serve these purposes and can be called money? In practice. and other checkable deposits (including travelers checks). The broadly defined money supply. These near-money assets are included in the broader measures of the money supply. currency. currency. For example. Thus. Some financial assets or instruments are not used directly for transactions but are easily and readily converted into a form that can be used for transactions. most transactions use checks. small time deposits (under $100.The savings of time.

the favored definition of the money stock for policy and for examining the effects of money on the economy is now M2.3 -------1.2 --------3600.1 374. Thus. Note that the growth rates in the different monetary aggregates can differ
47
.4 --------1147.6 --------4282.TABLE 4 MONETARY AGGREGATES. short-term Treasuries.6 176.4 5. the aggregate labeled L. the deregulation of financial institutions and the technological advances in banking since the 1970s has reduced the differences between assets in M1 and in M2.6 103.3 402.6 383.
In the 1960s and 1970s the monetarist economists emphasized the importance of the stock of the transactions asset.3 8. which adds other liquid assets to M3. An even broader measure is the total amount of credit or borrowing in the economy. the Fed reports data on total liquid assets.9 6.3 7.0
Total Debt of Domestic Nonfinancial sectors 12961.8 4.5 117.0% -0. This culminated in a 1979 decision by the Federal Reserve to conduct policy by targeting the growth in M1.0
NOTE: Totals do not add up due to omitted balancing items.4 27. In particular. some checkable deposits earn interest and deposit assets can be instantaneously moved into a transactions asset (at your corner cash machine).1 7. Commercial Paper L 5269.4 -------1. policy-makers began to follow the M1 aggregate closely. Thus. so the federal Reserve also monitors the total debt of the domestic nonfinancial sectors.0 -10. As a result.4 Percentage Change over 1993 10.7 -5.6 1145. DECEMBER 1994 Billions of $_ Currency Demand deposits OCDs Travelers checks M1 Savings deposits and MMDA Small time deposits MMMF Overnight RPS and Euro$ M2 Large time deposits Term RPs and Euro$ Institutional MMMF M3 353.9 7.4 -2. Some economists feel that the appropriate way of gauging the influence of the monetary sector and monetary policy on the economy is to consider the overall availability of spending power or credit rather than the quantity of transactions assets.5 818. Bankers Acceptances.0 -------0.9 2.2
Other liquid assets Savings bonds. However.0 363.

substantially. The stock of the transactions assets turns over at a rate—called velocity. V—in order to generate the transactions that underlie the level of nominal income—PY. PY: MV = PY Furthermore. then the quantity equation tells us that in the long-run the price level. is determined by the money stock. For the present. That is. So. The long-run equilibrium view of the money sector is given by the quantity equation
Quantity Equation MV = PY ⇒ The money stock determines the price level. the purchasing power parity is maintained. velocity.
Open Economy Equilibrium Conditions We will not develop a full model of the open economy at the present. but instead examine some of the long-run equilibrium conditions of an open economy. is determined by the real sector equilibrium. I would always buy goods where they are cheapest and so changes in demand would effect prices and exchange rates so that prices would be the same in all places. the rate of turnover. this makes the conduct of monetary policy a complex and confusing matter as we will see later on. M. Now if all goods are tradable and if the costs of transportation were small. we take a long-run view that states that in the long-run money determines the price level and the rate of money growth determines the inflation rate: %∆M + %∆V = %∆(PY) = %∆P + %∆Y SUMMARY: 5. Recall that the real exchange rate was defined as ereal =
p enom pf
If the real exchange rate is constant. However. The quantity equation relates the stock money to the level of nominal income. The quantity theory of money implies that change in the monetary sector affect the price level and have no other effects. M. The first open economy equilibrium condition was already presented in Chapter I. there can be substantial deviations from PPP in the short-run because goods are not always tradable. Y. the level of real output.
48
. if V is given and Y is fixed at Y*. For the present we will assume that there is a uniquely defined set of assets used for transactions purposes which we call money and label M. Y*. goods have the same price in the home and foreign countries. In addition. times the rate of turn over is equal to the level of nominal income. It states that the stock of money. so we will take it as given. The enormous emphasis on monetary policy suggests that there are some short-run effects of changes in monetary policy and the money stock that we will explore later. will in the long run be determined by the technology of the payments system. The next element of the long-run equilibrium model is the quantity theory of money. then we would expect purchasing power parity (PPP) to be maintained. P.

bonds. but my Chinese laundry is not in China even though laundry charges are surely less expensive there than in the U. and eexp is the expected nominal exchange rate (one year hence.S. I will have $10.06) (2/1.00 eexp = 1.S. bonds. i = .800 in one year. changes in the nominal exchange rate can be explained by relative inflation rates in the home and foreign countries. In addition.94 Are investments in U. The interest rate parity (IRP) condition is given by :
(1 + i ) = (1 + i f )
enom e exp
where i and i f are the domestic and foreign nominal interest rates respectively. the flow of capital should change interest rates and/or exchange rates so that the expected returns are equalized. + .000 in U. The expected return on the DM bonds was 9. goods are often non-tradable.000). bonds yield 8% and one-year German bonds yield 6%. and German bonds equivalent? If I buy $10. Recall that the expected exchange rate is 1. assuming that the interest rates are for a one-year period as well). The current nominal exchange rate is 2 and the nominal exchange rate expected one year from now is 1.I buy Chinese-made shirts because they are less expensive than American-made goods.000DM in a German bond that will be worth 21.94 so that the DM investment will be worth $10928 = 21200/1.S. I can use my $10. The interest rate parity can best be explained by an example.6 e = 2.0928) = (1.08 i f = 0. bonds.S. That is. enom is the nominal exchange rate which will simply be called e below.06*20.S. Alternatively. From the definition of the real exchange rate.S. I still might decide to hold U. we have the purchasing power parity condition: ⇒ ∆enom = %∆p f – %∆p
Exchange rates do not always change in order to maintain PPP for two reasons.28%. the expected returns from holding financial assets denominated in different currencies should be the same.94) Expected return = [(1 + i f )
e e exp
] −1
49
.000 to buy DM today at the exchange rate of 2 and invest the 20.200DM in one year (1.94. Consider a situation where one-year U. With the free flow of capital among countries. most importantly interest rates.94. Why? What important difference remains between holding of $ and DM bonds? The expected return on DM bonds is calculated from: (1 + . As noted above. more than the expected return on the U. Our second open economy equilibrium condition relates exchange rates to interest rates and is called appropriately interest rate parity. there are other influences on exchange rates. With a constant real exchange rate.

09. For example. The exchange rate at that tie was 107.88 Yen per dollar. 3-month CD rates in the U. The interest rate parity condition is that the expected return on foreign bond holdings shown above is equal to domestic bond returns.S.≈if −
∆e exp e
The expected return is approximately (an approximation that is close enough to be useful) equal to the foreign interest rate less the expected rate of change of the exchange rate. Interest rate parity Domestic interest rate is equal to foreign interest rate less the expected rate of exchange rate depreciation.
∆ e exp i =i − e
f
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. Purchasing Power Parity %∆enom = %∆pf – %∆p 7.94DM). Was the Yen expected to appreciate or depreciate and by how much? SUMMARY: The open economy equilibrium conditions are: 6.35% and 2.3 and the expected return was approximately . and Japan were 3.06–(-03) = . i.31% respectively in November 1993. the percentage change in eexp was –0. A comparison of domestic and foreign interest rates tells us something about the exchange rate expectations of representative market participants. In our example the $ was expected to appreciate by 3% (from 2DM to 1. The interest rate parity condition can be used to derive the expected exchange rate at that time.

the conditions that hold in the long-run equilibrium—the Fisher relationship. purchasing power parity.CHAPTER III UNDERSTANDING SHORT-RUN FLUCTUATIONS The business cycle fluctuations that are so pervasive in developed economies suggest that the economy is often not at its long run or natural equilibrium.S. In Chapter I.— do not always hold true in the short-run. Figure 1 shoes the importance of short-run macroeconomic fluctuations in the U. In this Chapter we will provide a theoretical framework to explain and interpret the rather strong and persistent short-run deviations from long-run equilibrium. we defined a business cycle and observed that there have been nine business cycle contractions or recessions in the post-World War II period.
51
. etc. Furthermore.

.

The simple Keynesian model is an application of the quantity adjustment paradigm.S. We will then provide a more general discussion of price changes and the reasons why they do not occur so frequently. and in the U. the real interest rate and the exchange rate—the prices of labor. Clearly. The simplest Keynesian model abstracts entirely from price changes. That is: If there is an imbalance between supply (output or production) and demand (expenditure). a prominent British economist of the interwar period. The Keynesian approach examines the aggregate demand for goods in real terms and describes the adjustments of the economy towards equilibrium. Together. at least in the short-run. The excruciating slowness of adjustments in modern macroeconomics needed some explanation. As unreasonable as that sounds. In the U. Real wage flexibility brings about labor sector equilibrium and the real interest rate balances the allocation of output between investment goods and consumption goods. We will start by showing why quantity adjustments are the most common responses. The argument can best be made by citing an example of a manufacturing industry where adjustments in the quantity of output are. QUANTITY ADJUSTMENT PARADIGM The principal theme of classical price theory that underlies the study of microeconomics is: If there is an imbalance between supply and demand in a competitive market. The Keynesian real sector model takes a different approach. the long-run equilibrium model in Chapter II utilizes the equilibrating role of prices. particularly in shortrun periods and when output is non-perishable. the equilibrium labor supply and capital stock (in turn determined by the amount of investment) determine the equilibrium output level. The emphasis in price theory is on the balancing role of prices. then producers will change the quantity of output produced. both price and quantity adjustments take place in actuality.K. The prices that maintain equilibrium in that model are the real wage. from the 1920s on. Keynes developed a sometimes puzzling ‘general theory’ (as he called it) that did not provide all of the answers but it nevertheless had an overwhelming influence on post-war macroeconomic thinking. it was clear that market mechanisms were not leading to an equilibrium that utilized all available resources. more important and more pervasive than adjustments in prices. disequilibrium leads to changes in the quantity of output. Keynes was dissatisfied with the inability of the classical equilibrium approach to provide an adequate understanding of the macro phenomena of his time—massive and persistent unemployment. then prices change to clear the market or establish equilibrium.
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. in the short-run. so we will relax the assumption shortly. It is so-called because its origins are found in the work of John Maynard Keynes. time and foreign currency.This part of macro theory is often called the Keynesian model. That is. In fact. the model is useful for understanding how short-run output changes occur. and elsewhere during the Depression of the 1930s. Similarly. In order to explore this approach we will assume that prices remain constant and examine the macroeconomic consequences of a model where quantity adjustments occur. for a time Keynesian modeling became synonymous with macroeconomics. The broader Keynesian model sheds light on the interactions between the demand for goods and services and the financial sector. The Keynesian model is useful for understanding how the economy adjusts towards its long-run equilibrium. The underlying theme of this approach is that output or quantity adjustments occur when there is an imbalance between supply and demand. It will provide the basis for examining the short-run effects of monetary and fiscal policy.

As an enterprising Economics professor. Automobile manufacturers often respond to excess inventory accumulation by reducing the quantity of automobiles produced. inventories will begin to rise about the desired level. price adjustments would dominate. Furthermore. The reason for this is that the costs of quantity adjustments have risen because the production work force is on a guaranteed annual wage. Second. If all output were homogeneous and markets perfectly competitive then price adjustments would clear the market. Nevertheless. would encourage sales and solve the inventory buildup problem. Thus. a change in price is often a costly and unreliable means of equilibrating sales and production. If we go to the wholesale produce market. a cut in output will almost certainly clear this unwanted inventory accumulation (although it could be frustrated by an unanticipated decline in sales). The firm knows the costs of shutting down an assembly line and laying off workers and will generally be able to plan the adjustment process. That is. If sales fall off. price rebates and other forms of price adjustments have become more common in the automobile industry in recent years. and (ii) the reasons why this is rational economic behavior. in the short run.” American Economic Review Papers and Proceedings. a price change takes time to put in place and the exact response of the consumers is often hard to judge. Alan Blinder (who has also served as vice-chairman of the Federal Reserve Board) interviewed corporations about their price change behavior. Thus. a quicker and more certain solution is found by making changes in the level of output. However. the argument presumes that goods can be held in inventory (which is by and large true for manufactured goods). which seem to be in a constant state of flux. we assume that there is some degree of product differentiation. In a modern economy with very rapid information flows and less emphasis on manufacturing and greater emphasis on services. “Why Are Prices Sticky? Preliminary Results From an Interview Study. Once the imbalance is recognized. or output. price changes do occur. Generally. If new cars are mounting up in the manufacturer’s storage lots. We will make this argument by showing (i) that most price changes are infrequent.1 He simply asked: “How often do the prices of your most important products change in a typical year?”
1
See Alan Binder. the manufacturer would have to have a precise estimate of the sensitivity of sales to price changes (the elasticity). some type of adjustment is necessary. we will find that the market for strawberries is cleared daily by price adjustments. we will present a less stringent argument. In the short-run. All in all. adjustment instead of a price adjustment because the outcome is more certain.
54
. In order to use a price response. Price changes—often in the form of price rebates—occur but less frequently. The producer could reduce the price of output and/or cut the level of production. and it can take weeks or months before sales respond to a price change. perhaps in the form of price rebates that are often used in the auto industry. price reduction is a very problematic way of removing the inventory imbalance. May 1991. quantity adjustments are the primary adjustment mechanism used to maintain sales-production equilibrium in the short run.Consider the case of an automobile manufacturer that monitors the level of inventories in order to judge whether there is an imbalance between sales and production. The example that comes to mind is airplane fares. This conclusion relies upon two characteristics of the product market. particularly when the imbalance may well be a temporary phenomenon and a rapid response is desired. Nevertheless. Some readers may find the argument for price adjustments too strong to be believable. a price reduction must be advertised. price adjustments are used in the automobile industry. First. If output were perishable. A cut in price. The automobile manufacturer chooses a quantity. Price rebates are offered when inventories are extremely large because in such instances the needed quantity adjustments (closing down production altogether) can be too costly. price changes are often made infrequently and therefore the principal adjustments to supply and demand imbalances in the shortrun are quantity changes.

For convenience.
A characteristic of the modern macroeconomy is that price changes tend to occur gradually.
55
. there are costs of price change (so-called menu costs—the cost of printing new menus) that inhibit price changes. firms are reluctant to change prices because they do not know whether other firms will follow suit. Among the reasons cited. The median response was annually and Blinder concluded that annual price change seems to describe behavior. start with the accounting definitions from Chapter I. we will develop the Keynesian approach to macroeconomics where. Firms also report delays of three or four months after a significant change in costs or demand before price adjustments are made. we ignore the accounting differences between Gross Domestic Product and national Income and call the sum simply real output or income. firms have implicit contractual arrangements (an “invisible handshake”) with customers which proscribe price increases when markets are tight and thereby preserve long-term customer relationships. Equation (1) is an identity that shows how actual output is allocated among the various expenditure categories and that the sum of expenditures is equal to income earned. YD —are equal. firms have explicit contractual relationships which fix prices for a period of time. to begin. If actual output differs from planned aggregate demand. To see how this works. Indeed. then quantity adjustments bring the economy back to balance. in order of importance are: • • • • • • firms respond to shocks by changing delivery lags or altering the quality of the auxiliary services provided. Recall that real GDP has four principal components: C I G NX = = = = consumption expenditures investment or capital formation government expenditure on goods and services (X–M) net exports
Total real GDP is equal to the sum of these components. we take prices as fixed and concentrate on the implications of output adjustments. Y can be called either real output or real income. The model simply examines whether actual output—YS —and the desire to absorb output—planned aggregate demand. THE PLANNED AGGREGATE DEMAND MODEL In this section we will construct the Keynesian model of aggregate demand that shows how the quantity adjustment paradigm works. total expenditure on all final goods and services is total real output or income. That is. firms base their prices on cost. which we call Y: Y = C + I + G + NX (1)
Since the value of output produced is equivalent to income earned in production. prices in the American economy are quite sticky.Less than 15 percent of the firms reported that prices are changed more frequently than quarterly. Thus. There are many reasons why a rational decision-maker might keep prices constant in the face of changing costs or demand. Blinder asked corporate executives to indicate which reasons were most important to them.

for example. Furthermore. Thus. To summarize. (Y – T). The level of government expenditure is taken to be exogenous—or determined independent of the economic structure. First. We will specify a simple model that is restricted to just the principle determinants. we will call the actual output decision or the supply of output YS . The next determinant of YD to consider is the level of interest rates. the relationship between output and planned aggregate demand can be written as: YD = Cd + Id + G + NXd YD = Cd([Y – T]. Real sector equilibrium is defined as a situation where the overall desire to absorb product—YD— is exactly equal to the output produced —YS : YS = YD (2)
Equilibrium in this context is a short-run equilibrium.) means that consumption is a function of the items in parentheses and the signs of the affects are shown below.e) where. dropped the assumptions that defined the long-run equilibrium level of output. Net exports will also depend on the exchange rate. Keynes hypothesized that planned consumption expenditures increase with income and. Saving is a positive function of interest rates and therefore consumption is a negative function of rates.
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. Cd (. we will assume that in the short-run wage and price adjustments do not occur. K and N). business enterprises. R. the amount of final output that the households. an assumption that we will relax later. Second. This relationship is the strongest for consumption expenditures that are the biggest—about two-thirds—part of output. An exchange rate appreciation—increase in e—leads to fewer exports and more imports. importantly. We will not allow output to vary from Y* and will analyze supply and demand forces that influence output in the short-run. We will retain Keynes’ assumption because it is supported by the bulk of empirical evidence. That is. net exports is a decreasing function of exchange rates. Net exports will also depend on the level of output and income because imports increase with the level of income. In the long run.Our point of departure from the accounting for actual output described by the identity (1) is to consider the underlying supply and demand behavior. equilibrium output is Y* which is determined by technology and resource availability (A. We have. Our discussion of the effect of interest rates on investment and saving from Chapter II is relevant here. A key contribution of the Keynesian approach to the real sector is that the major determinant of planned aggregate demand is the level of income itself. we will specify the determinants of consumption and investor behavior as well as the level of government expenditure and net exports. There are of course numerous factors that can influence the demand behavior of consumers or investors. and governments want to absorb or demand is called planned aggregate demand—YD . Investment demand is a decreasing function of interest rates. YS and particularly YD will vary with economic circumstances. for the time being. R) + Id (R) + G + NXd (Y. a $1 increase in income earned leads to a less than $1 increase in planned consumption. The consumption relationship shown below relates consumption to after tax income.. where T is the level of taxes. We will consider the forces that determine planned aggregate demand—YD—and then consider what happens when actual output and the sum of expenditure plans are not equal. He termed the ratio of the change in consumption to the change in income the marginal propensity to consume.

If expenditure or the demand for output exceeds the amount being produced. The components of planned aggregate demand are the same as in the previous section. they are the same in this simple framework) after taxes. Y. There is still one complication to note in this simple quantity adjustment process.Now. Generally. investment (I). it is consistent with the facts) that an increase in income leads to a somewhat smaller increment to planned aggregate demand. R) where C ( ) indicates the functional relationship. As output increases. The equilibrium condition (2) is that actual output is equal to planned aggregate demand: Y = YD . Consumption is a function of income (or output. We can use a specific algebraic version of the multiplier relationship to illustrate the effects. let taxes be a function of income: T = T(Y) Similarly. THE SIMPLE KEYNESIAN MULTIPLIER The planned aggregate demand model can be used to demonstrate the Keynesian multiplier relationship.
indicated by CY and is assumed to be less than one. will be dY
The equilibrium level of income. planned aggregate demand is the sum of its components: YD = C[Y – T(Y)] + I(R) + G + NX(Y. Producers will adjust the quantity of output and so YS will rise to YD . we assume (and as stated earlier.e) Thus.e) (3)
dC . is the solution to equation 3. the investment and net exports functions are: I = I(R) and NX = NX(Y. then there will be an unplanned or undesired depletion of inventories. In this simple model we assume that capacity constraints do not create any difficulties and that prices are unaffected. T. and interest rates: C = C ([Y – T]. The marginal propensity to consume. There will be a stable adjustment to a new equilibrium as long as an increase of output or income leads to a somewhat smaller increase in planned aggregate demand. This is why Keynes’ assumption about the marginal propensity to consume is important. The multiplier relationship is the effect on the quantity equilibrium of some outside or exogenous change that affects planned aggregate demand. government expenditure (G) and net exports (NX). given our specifications above for Cd and NXd . The model is highly simplified—there is no worry about price changes or capacity constraints. To add a further step of realism. Y. The algebraic model consists of two parts: an identity that defines Keynesian equilibrium and a specification of planned aggregate demand behavior. consumption ( C). planned aggregate demand will increase as well. The equilibrium condition is: Y = YS = YD We can see how the equilibrium value changes when there is an autonomous change in one of the determinants of demand by substituting for PAD from (2) in (3) and taking the total differential of equation (3): dY = CY(dY – T’dY) + IRdR + dG + NX YdY = NXede
57
. consider what happens if YD > YS.

The increase in income is just about 2 ½ times the increase in G. Of course.6 2365.5 + I 367. That is.8 ------24. T and NX of a change in income or the extent to which PAD changes when Y changes.) and also expected future income.
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. Wealth can be defined broadly to include actual assets held (financial assets. the major change in PAD between 1965 and 1968 was a very large increase (almost one-fourth) in the government’s real demand for goods and services.0
DETERMINANTS OF AGGREGATE DEMAND The different components of planned aggregate demand—Cd. so we can take autonomous expenditure as unchanged. the effect of income changes on net exports are so small that this term can be ignored.7 -29. etc.0 = C 1236. The effect on income—the government expenditure multiplier—is seen by setting the changes in the other exogenous variables to zero (dR = 0 and de = 0) and solving for dY/dG:
dY 1 = Y dG 1 − C (1 − T ′) − NYY
The size of the government expenditure multiplier in our model depends on several parameters—the effects on C. Although this simple model ignores many important economic relationships. The much smaller changes in I and NX canceled each other out.9 -------169. As shown below.6 -------278. But that will have to wait the development of a more general macroeconomic model.6 ------110.4 1405.0 391. the expansion of output during the Vietnam war years can be viewed as an application of the multiplier process described in this section. In those years. The mid-1960s episode is well described by the simple multiplier model.0 597. it can be useful. The functional specifications shown above are simplifications that focus on the most important determinants of demand.7 -------27. real estate.We can quickly see the effect on the equilibrium level of income of a government expenditure change. GNP in constant (1982) dollars Y 1965 1968 2087. we will provide a somewhat more general discussion of the determinants of aggregate demand. These rough estimates give a multiplier of 2 ½ with our model. For example.8. NXd—are affected by many different things. we would have to consider effects on interest rates. Id . if we look into developments in subsequent years. inflation rates and exchange rates as well. the wealth of the financial sector will influence its consumption plans. The average ratio of consumption to GDP after taxes is about . We can estimate the size of the multiplier by examining aggregate data to get reasonable estimates of the two parameters. the primary influence on the economy was the war-related expansion in demand and its impact through the multiplier process and quantity adjustments on total output.8 + G 487.6 + NX -2. Consumption Modern theories of consumption demand emphasize that consumption expenditures are not only related to current income but are also affected by the household’s overall command over resources. In this section. and taxes are about one-fourth of GDP.

If taxes were increased. We define the internal rate of return. Second. only a small tax increase was deemed necessary to constrain the economy. The multiplier expansion described above led to a rapid expansion in output. However. the tax increase. it is very important for two reasons. The public made the reasonable and correct inference that a temporary surcharge has little effect on overall lifetime resources and maintained its customary level of consumption demand by temporarily reducing savings. it varies a great deal and affects the behavior of GDP growth in the short run. which in turn determines productivity growth. for short run analysis we can consider investment to be a decreasing function of interest rates: I = I (R) Although investment is only about 16% of GDP.The role of wealth and expected income in determining consumption is very well illustrated by an episode that occurred in the late 1960s. The IRR will depend on the size of the capital stock already in place. The lower the interest rate relative to the internal rate of return. on the project as the discount rate that equates the stream of future returns to the project’s cost: Cost = ∑ t
RET (1 + IRR) t
As long as the cost of capital (from borrowing and/or obtaining equity capital) is less than the internal rate of return. Congress passed a temporary tax surcharge and every election campaign emphasized the temporary nature of this war surcharge. which does not change very much over time. during the war in Vietnam. although it reduced current income. The policy-makers were using our simple model in forecasting the effect of a tax increase on output through the multiplier. and the extent to which real living standards increase in the long run. Thus. Once labor and productive capacity were fully utilized. Because of the multiplier process. the larger the number of investment projects that will be attractive. …. quantity adjustments should no longer be feasible and price adjustments to excess demand pressures would be inevitable. the unemployment rate dropped to a historically low level of 3. RET3 . By late 1968. IRR. But the public was smarter. Thus. RET2. had little effect on consumption demand. we can write a function for investment demand as: I = f (IRR – R) where R is the interest rate. as described by our simple multiplier model above. When the cost of capital (or the interest rate for financing) is less than IRR. Investment As noted earlier.4%.
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. Policy-makers were concerned that the economy was operating at full capacity and that any further expansion to government expenditure would simply lead to the emergence of inflationary pressures. investment expenditures are sensitive to the rate of interest. the tax increase did not hold back an overheating economy and inflationary pressures did begin to emerge. then disposable income would fall and consumption demand would decline. The policy-makers had a ready solution. First. To mute the pain in an election year. as we well know tax increases are not politically popular. Consider how a firm might evaluate an investment project that is expected to generate a stream of returns for some time into the future which we can denote as: RET1. As a result. the project should be undertaken. This would set in motion a multiplier process in reverse and prevent the macroeconomy from overheating. We will begin by showing why this is the case and then discuss other determinants of investment. the size of investment determines the growth in the stock of capital. the project is expected to be profitable.

this is a simplification that ignores the vast number of different ways of financing investment projects. In empirical macroeconomic studies. It takes more dollars to buy a 10000Yen item and import demand will decline. Thus. It causes NX and planned aggregate demand to increase.. In fact. etc. However. the Keynesian real sector equilibrium can be affected by a large number of economic. Americans will shift toward domestic production and imports fall. and the financial sector. foreigners will find American goods more attractive and exports will increase. Furthermore. we assume that prices are constant in the short-run and therefore the nominal exchange rate determines NX. Two other empirically significant determinants of investment are corporate cash flow and the change in output. THE KEYNESIAN REAL SECTOR MODEL As we can see. Much business investment is financed internally by firms that use their own profits to finance investment. it is common to relate investment to a cost of capital that is an average of different financing costs. Of course. The relevant interest rate should represent the costs of equity financing. Output increases are a good indication that capacity constraints may soon be reached and therefore. So. Secondly. Thus. As Y increases. and. it means that 130 Yen trade for one dollar. when the newspaper reports the Yen exchange rate at 130. cash flow will influence investment activity because the use of internal funds saves any costs of obtaining financing. Foreign Sector The net exports component of planned aggregate demand depends first on the domestic and foreign income and second on the relative prices of foreign and domestic goods. For the moment we will concentrate on the influence of output and interest rates—Y and R. Firms are anxious to plan their production capacity needs in advance. then the dollar has depreciated in value. the market for money. In most of our discussions of the simple Keynesian model. An exchange rate depreciation makes foreign goods more expensive. private placements. political and other phenomena. the Yen price of an American $100 item will fall which makes it cheaper to the Japanese consumer. the demand for imported goods will rise and therefore NX falls. firms will still compare the internal rate of return on a project to other alternatives such as putting the accumulated profits in the bank. large output increases increase the demand for investment goods. Interest rates are important because they are the linkage between the real sector. there is likely to be a rapid increase in investment demand. financing with short-term obligations and long-term obligations. when cash flow increases. The reason for this is simply that we will be building some tools that will make it easy to expand the model to include the financial sector. then NX increases. In addition. First of all. the market for goods. As a reminder: The exchange rate is defined as the units of foreign currency per dollar. bank loans. If the exchange rate declines. Nevertheless. If the price of foreign goods rises relative to domestic goods. there are two building blocks of the Keynesian approach—the quantity adjustment paradigm that underlies our discussion of Keynesian real sector
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. an exchange rate depreciation increases exports and decreases imports.The interest rate is used here as a general measure of the cost of capital. also. In Chapter I we defined the real exchange rate which measures the relative price of foreign and domestic goods. Fees and the necessity to provide information to outside investors or lenders may make financing from external sources less attractive. NX also depends on the relative price of foreign and domestic goods. Expanding foreign economies will demand more American goods. the export component of NX will depend on economic conditions abroad. bond financing.

is a locus of points that represent real sector equilibrium.e. labeled IS. called exogenous or determined elsewhere—G. e. for a given IS curve. Finally.equilibrium and the Keynesian emphasis on the short-run role of interest rates in the monetary sector.
Figure 2 Derivation of IS Curve
R
A R1
R2
IS
Y1
Y2
Y
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. There will be different possible levels of output and interest rates—Y and R—for which the real sector will be in short-run equilibrium. and anything else that might affect demand). Given the level of the other variables. This line. An increase in the rate of interest increases the cost of financing investment projects and thus. we combine the two sectors to show how the full Keynesian model works. our emphasis here will be on the joint determination of output and interest rates and the short-run interactions between the real sector and the monetary sector.. for some values the level of planned aggregate demand will be exactly equal to the level of output produced: Y = Cd (Y – T.e) A particularly useful way of looking at the different possible output equilibrium is found in Figure 2. We will start by developing a summary presentation for the relationship between interest rates and the aggregate demand equilibrium. makes fewer investment projects profitable—planned aggregate demand is reduced. R) + Id (R) + G + NXd (Y. Thus. In the last section we showed how changes in interest rates affect planned aggregate demand. Of course. all the other exogenous factors that might affect PAD are held constant (i. The interest rate is measured on the vertical axis and output is on the horizontal axis. We will call the model that examines both of these markets—goods and money markets—the full Keynesian model and will show how the markets interact and determine equilibrium values for both output (Y) and interest rates (R). T. it gives the level of equilibrium output. For each interest rate. T and e—there are different possible equilibria where planned aggregated demand (the right hand side of the equation) is equal to Y. We will then develop the Keynesian approach to the monetary sector of the economy. That is. G.

An extreme case is when PAD is completely unaffected by changes in interest rates. a tool that summarizes the real sector model equilibrium concept and the role of interest rates. R1 . The slope of the IS curve is:
dR (1 − CY [1 − T ′] − NX y ) = dY CR + I R
The slope of the IS curve is negative because IR <0 and. If investment is unaffected by interest rates. The slope of the IS curve is obtained by taking the total differential with the values of G. The IS curve shifts out or to the right. NXy is minus the marginal propensity to import and IR is the effect of a change in interest rates on investment. then a change in interest rates has a large effect on investment demand. In this case the IS curve is vertical.e). That is. The size of the slope of the IS curve is important as well because it reflects the extent to which planned aggregate demand responds to changes in interest rates. By autonomous we mean those parts of PAD which are not influenced by the level of income. T and e held constant: dY = CY (dY – T1 dY) + C RdR + IR dR + NXY dY where CY is the marginal propensity to consume. IR = 0 and the slope is infinite. Consider again the above model where the consumption component of PAD depends on after tax income—C(Y – T)—and the investment component depends on interest rates—I(R)—and net exports depends on output and the exchange rate—NX(Y. imagine that the dollar exchange rate depreciates which leads to an improvement in the balance of trade. The IS curve shown in Figure 2 has a negative slope. output exceeds planned aggregate demand and producers will be accumulating undesired or unplanned inventories of goods. the position of the IS curve is determined by the level of the exogenous or autonomous components of PAD. points to the right of the IS curve will represent excess supply and points to the left will represent excess demand. For example. The real sector equilibrium is given by equation (3) above where output is set equal to the sum of the components of PAD. Furthermore. Generally. the marginal propensity to consume is less than one and the marginal propensity to import is small. Their appropriate quantity response is to reduce output. there is a real sector equilibrium where planned aggregate demand is equal to output or income. Thus. NX increases. If investment is relatively interest elastic.
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. Properties of the IS Curve IS curve slope. it can be readily shown why it is drawn in this way. assume that taxes. The position of the IS curve is determined by the variables other than the interest rate which shift the PAD curve. the output equilibrium. In this instance the IS curve will be relatively flat. More generally. Y2 . IS curve shifts. as an empirical matter. examine the point labeled A in Figure 2. At this point. This concludes the presentation of the IS curve.The curve is called an IS curve because along this curve planned Investment is equal to planned Saving. Points off of the IS curve represent disequilibria. is less than current output. For the interest rate at A. It will be a useful apparatus once we add on a model for the monetary sector. Y1 . the IS curve is vertical. For example. planned aggregate demand for any given interest rate increase and the level of output that equates Y and planned aggregate demand is greater. If PAD is interest inelastic then the IS curve is relatively steep. government expenditure and the exchange rate are exogenous.

To begin we will examine money demand by specifying the demand for real money balances or money holding measured in terms of its purchasing power. Consider an individual or business which will be making a certain amount of real expenditures (transactions) per year. The second Keynesian innovation is the money demand function. we will use some widely accepted post-Keynesian ideas to specify the money demand function. Keynes’ own explanation of money demand turned out to be inadequate. Why does the demand for money—the transactions asset—depend on the interest rate? This was an intriguing and controversial issue in the early years of Keynesian economics. Since the stock of money assets. Thus. We have already examined the first. The amount of money. However. Our first task is to show how and why real income and the interest rate affect the demand for money. will depend on the k chosen. Thus. which will on average be held. Next. We will describe below that liquidity preference depends on income and interest rates. the arguments of the function. L(. A definition of money was presented in Chapter II. Should it plan to start the year with sufficient holdings of money to cover all transactions. Our discussion of the real or goods sector focused on the real or constant dollar level of demand or output. where k is the number of financial transactions (or sales of assets for money) which k2
63
. Our specification of the money demand function or the demand for real money balances is:
(
M D ) = L( Y . When the IS and LM curves are combined. we will be able to examine the interaction between the real and monetary sectors. as Y increases the demand for money holding will increase as well. is not the one that Keynes suggested. the demand for real money balances is a function of liquidity preference to use Keynes’ own terminology. The answer. real money balances are given by (M/P) where P is the aggregate price level. or should it plan to make financial transactions during the year to replenish its money stock holdings? In the first instance it will have an average stock of money of money stock of
M . We will now show how movements in interest rates maintain equilibrium between the supply and demand for money. the quantity adjustment paradigm as a way of looking at real sector adjustments.). R ) P
That is. Y. which is now standard.MONETARY SECTOR In this section we will introduce the role of money. In the second instance it will have an average 2
are made. and the interest rate. is a nominal quantity. R. It was innovative because classical thinking did not investigate the desire to hold money balances. Thus. Money demand is positively related to the level of income because the volume of transactions increases with Y. are the level of real income or output. Thus. we use the letter L to denote the money demand function. M. Money Demand Function In our presentation of macroeconomics there are two major Keynesian contributions. Y. we turn to the relationship between money demand and the interest rate. The monetary sector equilibrium will be summarized by the LM curve.
M . We will provide a post-Keynesian argument that relates the demand for transactions balances (money) to interest rates that was developed in the early 1950s by James Tobin and William Baumol.

The choice of k depends in turn on the cost of transactions and the opportunity cost of holding money. The transactions costs are the bank fees, brokerage commission or ATM charge that is incurred when an asset (e.g., a bond or savings account) is converted to a transaction fee and, also, the value of your time used in the transaction. The opportunity cost is the earnings foregone when money is held instead of the alternative financial asset (typically, a financial asset which earns interest). If k is larger, then there are more transactions and more fees paid. However, when k is larger the average cash balance is smaller and the opportunity costs—the foregone interest earnings—are smaller. The choice of k will depend on the size of the opportunity costs. The direction of the argument should be clear. If the interest rate goes up, the opportunity cost of holding money increases and it will be advantageous to make more frequent financial transactions (choose a higher k). In other words, as interest rates rise, the average money balance held will decline. Thus, the demand for money is inversely related to the rate of interest. Money Market Equilibrium The supply of money or the stock in existence is determined by the interaction of the banking system and monetary policy. We will discuss this process later and for the present we will take the size of the real money supply to be exogenous. Equilibrium in the money market exists when the demand for money, liquidity preference—L(Y,R), is equal to the exogenous supply of real money balances,

M . P

Money market equilibrium is illustrated in Figure 3. The quantity of real money is measured along the horizontal axis and the interest rate is measured along the vertical axis. Since money demand is inversely related to interest rates, the money demand function is negatively sloped. There is a family of money demand curves shown because the relationship between money demand and R depends on the level of output as well. For any given level of real output, there is a negatively sloped money demand curve. The money demand curve shifts out as Y increases. In Figure 3, Y3 > Y2 > Y1 . Since the money supply is exogenous, the given money supply is indicated by a vertical line; it is unaffected by interest rates.

Figure 3 Derivation of LM Curves
Money Supply R

R3

R2

R1

( Y3) Money ( Y2) Demand

( Y1 ) M 1/P M2 /P M/P

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Thus for an exogenous real money supply of

That is, there are different combinations of Y and R that lead to a level of real money demand equal to

M1 , the possible money market equilibria are indicated. P

M1 and therefore money market equilibrium. P
These different points of money market equilibrium are summarized by the LM curve in Figure 4. It is called the LM curve because liquidity preference (money demand) is equal to the real money supply. We will shortly examine a model of equilibrium in the goods market (summarized by the IS curve) and equilibrium in the money market (summarized by the LM curve) that provides us with an explanation of how output and interest rates are determined. Figure 4 shows money market equilibrium at R1 when output is Y1 , R2 for output Y2 , etc. These are points along the solid LM curve in Figure 4. Similarly, for a higher money supply, the LM curve is shown by the dotted line.

Figure 4 Shift of LM Curve

R LM (M 1 /P) R3 LM (M 2 /P)

R2

R1

Y1

Y2

Y3

Y

Properties of the LM Curve The LM curve represents a set of money market equilibrium. That is, supply equals demand:

(

M D M ) = ( )S P P

We can drop the superscripts and write the LM curve for money market equilibrium as:

(

M ) = L( Y , R ) P

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where the real money stock, M/P, is exogenously determined. It is clear from Figure 4 that the LM curve is positively sloped. We can see it as well by taking the total differential of money market equilibrium condition:

d(

M ) = LY dY + LR dR P M ) = 0 and P

An LM curve is drawn for a given level of the real money stock so along an LM curve d ( the curve’s slope is:

dR − LY = dY LR
which is positive because LY , the effect of output on money demand is positive and LR, the effect of interest rates on money demand is negative. The size of the slope depends on the income and interest effects or elasticities of money demand. Of particular interest to economists is the interest elasticity of money demand. If the interest elasticity of money demand (the effect of a change in R on money demand) is very small, then LR is small, and the slope is large and the LM curve is very steep. Similarly, a highly elastic or interest responsive money demand function will result in a relatively flat LM curve. The slope and position of the LM curve can also be shown geometrically. To begin, assume that point A in Figure 5 is a combination of Y and R that results in money market equilibrium. To derive the LM curve, imagine that the level of output increases. Does point B also result in money market equilibrium? It cannot because the increase in Y increases money demand and the money supply is unchanged. Point B must be a situation of excess demand for money balances.
Figure 5 Slope of LM Curve
LM1

R

LM2

C’

C

A

B

Y

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a disequilibrium between the supply of and the demand for money will lead to changes in the holdings of other financial assets. If the real money supply increases (due to either an increase in M and/or a decline in P). If the demand and supply for money are not in equilibrium. With a higher real money stock. there will be excess supply of money at A. To see how such portfolio adjustments occur and affect the economy. Consider the situation at point A in Figure 6. if money demand does not respond very much to changes in interest rates. Therefore. at some higher levels of output and/or lower levels of interest rates. However. We have not introduced the adjustment mechanism for the money market. money demand will be sufficiently increased to reestablish equilibrium. For the goods market we started the analysis with the adjustment mechanism—the quantity adjustment paradigm. That is. then the production decisions of producers would bring the economy towards equilibrium. only a large increase in R would reestablish equilibrium.However. In this case the new equilibrium is at point C’ and the LM curve is steep. Thus. an increase in interest rates from the level at point B would lead economic agents to economize on their holding of the money asset and money demand would fall. It showed that if output and planned aggregate demand were not equal. a small increase in R would reduce money demand sufficiently to restore equilibrium. For the higher money supply (M 2 /P) there is a new LM curve to the right of the original one. With the initial real money supply M 1 /P there is money market equilibrium at point A. A similar geometric argument can be used to demonstrate the effect of change in the real money stock on the LM curve. consider that the demand for money at existing output and interest rate levels is greater that the real money balances held. economic units will attempt to increase their
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. albeit the one used for transactions. If money demand is very responsive to changes in interest rates. existing money holdings are lower than the desired level. will A still be an equilibrium? The answer is clearly no. Alternatively.
Figure 6 Shift of LM Curve
R
LM (M 1 /P) LM (M 2/P)
A
Y
Equilibrium Adjustments Our discussion of the money market model has so far omitted one important issue—the adjustment mechanism. what adjustments occur and do they bring the market towards equilibrium? Our approach to disequilibrium adjustments in the money market follows the Keynesian view that money is a financial asset. In that case point C would be an equilibrium and the LM curve is flat.

Shifts outward (rightward) when there is an autonomous increase in PAD. the attempt to replenish money holdings leads to an increase in interest rates and a movement toward the LM curve. The market interest rate on these bonds is 10/90 = 0. The approach presented here is that interest rate changes are the equilibrium adjustment mechanism in the money market. horizontal movement toward the IS curve occurs as quantity adjustments eliminate the disequilibrium in the goods market.111. Government taxation and expenditure (fiscal) policy influences the position of the IS curve. there are other adjustment processes that are possible. If there is excess demand or supply. the purchaser of a bond now receives a $10 annual return on a $90 investment. That is. As bonds are sold.
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. the excess money demand sets in motion financial asset sales as individuals try to reequilibrate their portfolios. In other words. interest rates go up. bond purchases lead to lower rates. the price of bonds goes down and the yield on existing bonds increases. Is steep when money demand does not vary much with interest (rates demand is interestinelastic). Similarly. money demand falls and ultimately equilibrium is reestablished. when there is an excess supply of money.
Remember that bond prices fall when interest rates increase. However. As interest rates increase. in the case of an excess supply of money. or in other words. Thus. their prices fall and market interest rates increase. we will see how the IS-LM model with the Keynesian adjustment mechanisms works. the money market disequilibrium might have direct effects on the goods market. Imagine that an increase in the level of economic activity leads to an increase in the demand for money for transactions and that monetary policy has not changed the available money stock. I might respond by buying physical assets or by increasing my consumption expenditures. say. The bond still pays a $10 annual coupon. we postulated that economic agents will rebalance their financial asset portfolios by buying bonds which leads to a change in interest rates.2 Thus. These bond sales cause interest rates to rise which reduces money demand. or 11. However. For example.money holdings. There is an excess money demand. SUMMARY OF THE IS-LM MODEL Before we proceed we can summarize the main features of the IS and LM curves: IS Curve • • • • • • Has a negative (downward) slope Is steep when PAD does not vary much with interest rates (investment is interest-inelastic) There is excess demand (supply) in the goods market to the left (right) of the IS curve.1 percent. to $90. To summarize. Economic agents would like to maintain higher money balances. In the above discussion market pressures push the price of bonds down. This possibility is emphasized by many monetarists and we will explore its implications later on. In the Keynesian scheme this is done by selling other financial assets. shifting part of their portfolios from bonds and deposits to money assets. The rate of interest on these bonds is 10 percent. How can an individual increase his money holding? Individual agents will increase their money holding by selling other financial assets. as they sell bonds. However. Suppose that initially bonds are issued for $100 and that each bond carries a $10 annual interst coupon.
LM Curve • •
2
Has a positive (upward) slope. interest rate adjustments are the mechanism that equilibrate the money market. There are other ways that economic agents might respond to an excess supply of money. If I discover that my money holding exceeds my demand. First.

Consider now a fiscal policy expansion.
ANALYSIS OF MONETARY AND FISCAL POLICY Probably the most important application of the IS-LM model is for the analysis of the effects of monetary and fiscal policies. the level of government expenditures increases from G to G’. The IS and LM curves are drawn for particular levels of the exogenous variables. The effects of this change are illustrated in Figure 8. G and T. the IS or LM curve will shift and the equilibrium will change. The purpose of this section is to examine the effects of policy changes with the model. This is an important point because if any one of these variables changes. Similarly. and NX.
Figure 7 IS-LM Equilibrium
R
LM (M/P)
IS (G. Monetary policy operates through the real money stock (M/P) to position the LM curve.
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. The initial IS-LM equilibrium is at point A. The increase in government expenditures shifts the IS curve and the new equilibrium is at point B. As noted in parentheses on the diagram the positions of the curves are fixed by the variables that are determined outside the model. An IS-LM equilibrium is shown in Figure 7. NX. vertical movement toward the curve occurs as interest rates change to eliminate the disequilibrium. If there is excess demand or supply in the money market. the IS curve is drawn for given levels of the fiscal policy variables. Shifts outward (rightward) when there is an autonomous increase in the real money stock (M/P). The LM curve is a locus of money market equilibrium for a given level of the real money supply (M/P).• • • •
There is excess demand (supply) in money market to the right (left) of the LM curve. T)
Y
Fiscal Policy We discussed earlier how a change in an exogenous component of planned aggregate demand will shift the IS curve.

The simple Keynesian multiplier response would result in an output level of Y3 in Figure 8. The increase in government expenditure which shifts the IS curve causes income to increase because of a production response to increased demand (the multiplier process). or.
These factors affect the slopes of the IS and LM curves and determine whether a given stimulus will lead to a large or a small change in output. However. The response of the economy to the fiscal expansion is an example of the multiplier response. Increased income (and transactions) increases the demand for money. and interest rates rise from R1 and R2 in order to maintain money market equilibrium. This is a Keynesian explanation of the channels by which fiscal policy affects the economy. when fiscal policy changes. the simple model excluded any effects on the demand for money and feedback from the financial sector to the real sector. That is. We need to examine these processes closely. Higher interest rates reduce investment and aggregate demand and constrain the multiplier-induced increases in output. Thus. is the new equilibrium reached in 1 quarter. However. 10 years? Finally. the interaction with the financial sector leads instead to an equilibrium at Y2 because the multiplier expansion is held back by the increase in the interest rate. The responsiveness of investment demand to interest rates. the new equilibrium level of output is Y2 . the analysis does not describe the precise path followed by the economy as it moves from point A to point B in Figure 8. Another issue for later discussion is the length of time that equilibrium adjustments take to occur. The magnitude of the expenditure multiplier. 1 year.Figure 8 Effect of an Increase in Government Expenditures
R
LM
B R2 A D
R1
IS(G’) IS(G ) Y1 Y2 Y3 Y
The increase in output and interest rates that occur are the consequence of some important economic process and not just curve shifts. We will return to this issue later.
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. The extent to which fiscal policy changes the equilibrium level of output depends on several factors: 1) 2) 3) The responsiveness of the demand for money to interest rates.

or equivalently. Thus. if the higher interest rate does not affect PAD. This in turn induces investment demand and an expansion of output from Y1 to Y2 through the multiplier process. consider the case where planned aggregate demand is unaffected by interest rates. An increase in the money supply will shift the LM curve to the right (see Figure 9). Monetary Policy We can now also describe the channels of the effects of monetary policy in the Keynesian world. and distinguishing among them is very important for both policy analysis and forecasting. dG
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. Once again we need an economic analysis to tell us why this movement occurs. market interest rates decline. An increase in the money supply creates an excess supply of money. the impact of a change in interest rates on investment may take a long time. A likely scenario may involve a movement from A to D and then to B in Figure 8. This is based on the notion that the money markets equilibrate quickly when the money supply expands. which causes interest rates to rise. The expansion of output increases money demand. We must rely on empirical studies with econometric models to fill in the details. The effect on output of a fiscal expansion (
A fiscal expansion that starts the multiplier process going also leads to increased money demand and higher interest rates. it is likely that the demand for money will respond very quickly. The price of bonds goes up. In order to adjust their money holdings. and the equilibrium point will shift from A to B. However. they purchase other financial assets. However. economic units find that they are holding more money than they would like to.When fiscal policy changes and the multiplier process begins. The logic of this is simple.
Figure 9 Effect of an Increase in the Money Supply
R
A
B
B
A likely sequence of these events is given by the path from A to C to B. Other paths are also plausible. the multiplier process is
dY ) is large. Interest rates fall. Special Cases First. With money supply M’ and the economy at point A. and over time this leads to a gradual increase in investment expenditure and a multiplier expansion. and investment is interest inelastic. the real goods market may respond to the stimulus from the increase in government expenditure and the rise in interest rates before investment is affected.

The necessary interventions were often beyond the financing capabilities of the central banks. Exchange rates were set by international agreement and only occasional adjustments were made to the fixed rates. Many economists who take a monetarist approach emphasize the transactions role of money and importance of the quantity of money available. The International Monetary Fund. which we will discuss later. The second case to consider is when money demand is interest inelastic.not restrained. If my empirical judgment is that PAD is relatively unaffected by interest rates. then I will view fiscal policy changes as very important and monetary policy of little consequence. In this special case. THE KEYNESIAN MODEL IN THE OPEN ECONOMY The Keynesian model developed so far provides an analysis of equilibrium in the real sector (goods market) and the financial sector (money market). the monetary policy effect on output is very large and the fiscal policy effect on output is zero. That is the Keynesian channel for the influence of monetary policy. we have so far omitted any discussion of the foreign sector and the open economy implications of the model. monetary policy has an important effect on output and fiscal policy has none. Exchange Rates A major influence of the foreign sector on aggregate demand is through the influence of exchange rates on planned aggregate demand. Many of the Depression era Keynesian economists had this view. the Keynesians had a preference for fiscal policy over monetary policy. the relationship is non-existent. It is also clear that the multiplier for a money supply change on output
dY is zero when aggregate d ( M / P)
demand is unaffected by interest rates. Their depression era experiences led them to conclude that PAD was interest inelastic. This preference was not due to any theoretical issue but instead was a consequence of the empirical judgment about the strength of the interest rate effect on aggregate demand. Monetarist economists often emphasize monetary policy and eschew fiscal policy. the reader should check why this corresponds to a vertical LM curve. As a consequence. provided an international lending facility which enabled the central banks to intervene and maintain the fixed exchange rates. The reason for this is that the channel that connects the monetary sector to the real sector is inoperative. which was established in the aftermath of the Second World War. They place little importance on the relationship between money demand and interest rates. the major world currencies were on a fixed exchange rate regime. However. This relationship was already discussed in the previous chapter. It is called the fiscalist case because it leads to a preference for fiscal policy over monetary policy. This is an important issue to examine because the most significant structural change in the American economy in the last generation has been its internationalization. it became increasingly difficult to maintain fixed rates. Also. In this case. In addition. As the volume of international trade and financial flows grew rapidly. They have other reasons for this view. differences in growth rates and inflation rates among countries resulted in a
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. As a result. In this section we will examine the relationship between the domestic IS-LM Keynesian equilibrium and the foreign sector. This case is called the monetarist case. The rates were maintained via central bank intervention in the foreign exchange markets. the change in interest rates has no effect on the real sector so the monetary expansion is impotent. This is the case of a vertical IS curve. For the first 25 years after World War II. In this case. An expansion of the money supply leads to lower interest rates that under normal circumstances effect PAD.

Depreciation is undesirable because it increases the costs of important raw material imports and goods without any domestic substitutes. An appreciation (an increase in the exchange rate) will lead to an increase in real expenditures on imports and a decrease in real exports. The Federal Reserve took distinct steps towards a looser monetary policy throughout the latter half of 1990. Nevertheless. The exchange rate is largely determined by the influences of supply and demand. A dollar depreciation will increase net exports and shift the IS curve to the right. Similarly. If asset holders sell dollars and buy foreign financial assets. As a consequence. goods to foreigners will be relatively higher. the central bank might be inhibited by concern with the exchange rate.e) The other major influence on planned net exports is U. Exchange rates are now determined by market forces. It is notoriously difficult to generalize about exchange rate movements. the demand for imports will go up. a currency depreciation leads to imported inflation even when there is no danger of excess demand inflation domestically. Thus. there are central bank efforts to intervene in the foreign exchange markets. Since net exports are exports less imports. suggest that a looser policy is appropriate. were about 200 points lower than in the summer of
73
. at this time. we will consider the exchange rate and international market implications of a change in domestic policy. We showed earlier that the PAD curve will shift when the exchange rate changes. That is. By 1973. What are the open economy implications of these changes? As output and income increase. Import demand increases with income. A case in point occurred in 1990–1991.S. and we will examine the open economy implications of monetary and fiscal policy changes. we can write a function for net exports as: NX = NX(Y. The Federal Reserve and other central banks do enter the markets to effect the exchange rate. In a world of fixed exchange rates. It is also the case that the IS curve shifts with a change in e. the fall in interest rates makes dollar denominated financial assets less attractive. It might avoid an expansionary monetary policy if it views a currency depreciation to be undesirable. central bank interventions are probably not the major determinant of the exchange rate.S. an expansionary monetary policy puts downward pressure on the exchange rate. then the dollar depreciates.S. They are often dominated by the tastes and expectations of asset holders around the world. Monetary Policy in an Open Economy In this section we will assume that the economy starts with a domestic and international equilibrium. If a currency depreciation is undesirable. However. This effect is important because many imported consumer goods are highly income elastic. The demand for foreign exchange will lead to a depreciation of the dollar. In summary. income since import demand is highly income elastic. this hampers the ability of the central bank to follow an expansionary monetary policy. the major economies had moved to a floating exchange rate regime.need for more frequent realignments of the fixed rates. the fixed exchange rate regime began to falter. We know that an expansionary monetary policy will tend to increase output (Y) and reduce interest rates (R). Even in a flexible exchange rate regime. such as a recession and excess capacity. We should not assume that in every instance a looser monetary policy causes a currency depreciation. the central bank may hesitate to adopt an expansionary monetary policy even when domestic economic conditions. Foreign goods will decline in relative price for Americans and the price of U. By early 1991 short-term interest rates in the U.

there have been large periods in the postwar decades when the economy was operating at or near full capacity. Furthermore. Short-run changes in the demand for foreign currency due to trade flows are simply not large enough to dominate other factors in the exchange market. The depression era Keynesians did not worry about such a situation since in their experience output was far below a capacity level. A negative trade balance will put downward pressure on the exchange rate. The economic fundamentals took the back seat.
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. Fiscal Policy in an Open Economy A simple IS-LM analysis tells us that an expansionary fiscal policy leads to higher interest rates and a higher level of output. This step will help us link the long-run equilibrium concepts presented in Chapter II to the Keynesian short-run equilibrium discussed here. In the short-run. The fiscal policy expansion sets in motion forces for both depreciation and appreciation of the currency. However. the trade deficit does affect the expectations and tastes of the foreign exchange traders. particularly when the IS-LM equilibrium is not at the overall long-run equilibrium level of output. capacity output is really a broad range. but this effect was rather small and could not have put much upward pressure on exchange rates. All in all. if productive capacity is fully utilized and labor fully employed. What are the open economy implications of these changes? To begin. the trade balance is small in comparison to the cross-border financial flows that occur daily. price adjustments to changes in demand are as important as quantity adjustments. international financial markets were not well integrated. The decline in interest rates should lead to a depreciation of the dollar. Therefore. then an increase in demand will inevitably lead to inflation. the expansion of output and income leads to an increase in imports. At that time. At the same time. the dollar increased in value by about 15% against most major currencies. our next step in building a framework for macroeconomics is to incorporate price adjustments in our model and to develop an explanation of inflation. However. Although the U. it was rather surprising that in the first three months of 1991. it is clear that in the modern macroeconomy. trade deficit exceeded $150 billion in 1987. even the most ardent Keynesian would acknowledge that price adjustments can occur. Specifically. THE NEXT STEP: BACK TO LONG-RUN EQUILIBRIUM The entire discussion of the full Keynesian equilibrium has been conducted within the quantity adjustment paradigm.S. At the same time. this figure is small relative to the annual volume of foreign exchange trading that occurs in the world markets. Markets in different countries were segmented or separated from one another so differences in interest rates would not lead to large portfolio adjustments. the recession led to a weakening of import demand. Y*. the increase in interest rates makes dollar denominated financial assets more attractive and leads to a dollar appreciation. The demand for foreign exchange was largely driven by the trade balance. Some industries and sectors begin to hit the constraints before others. Thus. the answer would have been that the trade balance was the dominant determinant of exchange rate movements.1990. Of course. At the present time. Which is stronger? A generation ago. the trade deficit is not large enough to exert much influence in the market. In this episode exchange rate movements were determined by changing attitudes and expectations that were related to the military and political events in the Gulf.

this discussion will be used to discuss policy. of the nominal money supply. The assumption of fixed or sticky prices is in fact defensible when we restrict ourselves to very short periods of time. The total demand curve summarizes this relationship between the price level and the output level determined by the intersection of the IS and LM curves. TOTAL DEMAND AND SUPPLY ANALYSIS The Keynesian IS-LM model developed earlier is a model of only demand behavior. The Keynesian approach is useful because it shows how the real and monetary sectors are affected by policy or any other shock to equilibrium. The total demand curve is a locus of Keynesian aggregate demand equilibrium for different price levels. We will now extend the model so that we can discuss price behavior and inflation. thus positioning the LM curve and determining the aggregate demand equilibrium. That is. in the IS-LM model there will be a different output equilibrium for each level of prices. although it does appear in the model structure. or purchasing power. we will take a more general view of price determination and develop an explanation of inflation—the rate of price change. We begin this Chapter with an extension of the Keynesian model that allows us to discuss price flexibility and relate the Keynesian demand equilibrium (the topic of Chapter III) to the long-run neoclassical equilibrium (the topic of Chapter II). we always assumed (albeit implicitly) that the supply of output would and could adjust. any shock to the economy that is likely to have effects that extend beyond six months or a year is also going to have implications for price behavior. The price level determines the real value. the main drawback of the model is that it retains the assumption that the only relevant real sector adjustments are quantities produced. The total demand curve shows how the Keynesian equilibrium changes for different values of the price level. It showed how real sector quantity adjustments interact with the demand for money via the role of interest rates. That is. This analysis is called total supply and total demand analysis and it relates the level of output to the price level. The position of the LM curve will change if prices change. Total Demand Curve The price level is an exogenous variable in the Keynesian aggregate demand model. In the second half of this Chapter. Throughout the discussion of PAD in Chapter III. Since most everyone thinks of the inflation rate as the relevant macroeconomic variable. The total demand curve shows how changes in the price level affects the IS-LM or demand side equilibrium. less than a year or so. M) remains the
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. prices were assumed unchanged for the entire discussion. the output equilibrium changes as well. Total supply and demand analysis breaks that implicit assumption and introduces the possibility of supply constraints or economic issues that can affect supply behavior. However.CHAPTER IV INFLATION AND THE COMPLETE MACROECONOMIC MODEL The last Chapter presented the Keynesian model of the real and monetary sectors of the economy. It tells us how the equilibrium between planned aggregate demand and output is achieved. and as it does. We then turn to the determination of supply behavior and derive different approaches to the total supply curve. We begin by deriving a total demand curve from the IS-LM analysis. it is not determined by the system. However. If the price level changes while everything else (including the nominal money supply. It describes demand behavior but says absolutely nothing about supply behavior. The model determines the equilibrium values of real output and interest rates.

For the price level P0 . An increase in the domestic price level tends to encourage the demand for imported goods and discourage exports. It is called the total demand curve because it summarizes equilibrium on the demand side of the economy. the real value of P0
Figure 1 Derivation of Total Demand Curve
R
LM (M/P1 ) LM (M/P0 )
IS
P
Y
P1 P0 D
Y1
Y0
Y
The lower panel of Figure 1 shows the equilibrium level of output that corresponds to each price level. The negative slope of the total demand curve follows from the derivation shown in Figure 1 and also agrees with one’s intuition. When prices increase. If the price level increases to P1 . Similarly. the LM curve is given by LM (
M ) causes the IS-LM equilibrium to change. Another channel that relates the aggregate demand equilibrium to the price level is the foreign sector. or aggregate demand. nominal income also increases and the demand for money to be used for transactions goes up. the output equilibrium is lower when the price level increases. Consequently. The LM curve is given by LM(M/P1) and the demand side output equilibrium is Y1 . An increase in the price level with a given nominal money supply is equivalent to a contractionary monetary policy. it reduces the real money supply. then the resulting change in the real money supply (
To be more precise. The curve labeled D is a locus of IS-LM. This “tightness” in financial markets and/or the interest rate increases that will result restrain aggregate demand.same. If the nominal money supply is unchanged. Thus an increase in prices reduces net exports and restrains aggregate demand.
M ) and output is Y0 . there will be a shortage of transactions balances. equilibria. P
the money supply will be reduced. consider the situation shown in the upper panel of Figure 1. Since a higher price level contracts the real money supply. for each value of the price level there will be a different aggregate demand equilibrium. The price increase is equivalent to a tighter money policy and similarly leads to a fall in the demand for output.
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. a higher price level is associated with a lower output equilibrium.

It describes the amount of output that producers are willing and able to supply to the goods market. consider an aggregate demand shock that shifts the IS curve to the right. Thus. the IS curve shifts and the equilibrium for the same price level is at point B. the demand equilibrium will be at a higher output level. The total demand curve describes the amount of output that people are willing to buy at different price levels. There is sufficient excess capacity so that an increase in demand leads to more production without increasing production costs and prices. For any price level that fixes the position of the LM curve. Point A is an IS-LM equilibrium for price P0 . Points A and B correspond to two points on separate total demand curves as shown in the bottom panel. taxes.The total demand curve in Figure 1 is drawn for given values of all the exogenous variables in the IS-LM model. the exogenous increase in demand shifts the total demand curve to the right. For example. For this reason the early Keynesian economists who were schooled by the
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. We will have several different ways of looking at supply behavior. The total demand curve shifts when an exogenous shock such as a policy change effects the IS-LM equilibrium. A change in the level of government expenditure. but the levels of output and price that will actually emerge also depend on supply behavior. or the nominal money supply will affect the aggregate demand equilibrium for every price level and thereby affect the position of the total demand curve. If there is an exogenous shift in aggregate demand. whatever output level is demanded will be produced and the total supply curve is a horizontal line. This particular case is shown in Figure 2. Thus. Keynesian Supply Curve The total supply curve implicit in the Keynesian IS-LM model is based on the notion that there are no supply constraints and that prices are pre-determined in the short-run (one year or less).
Figure 2 Shifts in the Total Demand Curve
R
B LM (M/P0 )
A
IS
P
Y
P0
D
Y
Total Supply Curve A new concept in our discussions—the total supply curve—is both the more interesting and the more problematic aspect of this analysis.

experiences of the depression used IS-LM analysis exclusively because they thought in terms of situations with a great deal of excess productive capacity. A large shift outward in the IS or LM curves leads to a shift out in the D curve. Figure 3 shows the horizontal total supply curve. we must consider whether producers will change their pricing decisions. It is assumed that any level of output can be supplied at this given level of prices. D. In addition. The real and monetary sector interactions occur without any implications for prices. no matter how large the demand shift happens to be.
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. The output equilibrium is strictly determined by the IS-LM equilibrium. Over longer periods of time. if output increases. The higher the output level. the quicker and more likely such price adjustments will be. and price lists. The classical view implies a vertical supply curve. Now. as shown in Figure 4. which positions the total demand curve. which is labeled S.
Figure 3 Short-Run (Keynesian) Total Supply Curve
P
S
D
Y
Long-Run or Classical Supply Curve At the opposite extreme to the Keynesian short-run horizontal supply curve lies the supply curve implicit in the long-run equilibrium or classical view of the macroeconomic world that was discussed in Chapter II. The lack of realism in the Keynesian demand model quickly becomes clear when we consider Figure 3. it is necessary to ask whether capacity constraints in particular industries are likely to lead to price adjustments. we can view the price level as being set by existing contractual arrangements such as union contracts. the horizontal supply curve may be appropriate when we are just considering very short-run periods (surely no more than 6 to 12 months) and when the output level is sufficiently far away from any capacity constraints. In this framework. The horizontal total supply curve (implicit in the simple Keynesian approach) implies that supply behavior is completely unaffected by the level of output or demand. sales agreements.

The classical approach introduces a theory of price determination. neither of which is a satisfactory representation of behavior in the real world. In this view each and every market for outputs and inputs reaches an equilibrium which determines both the relative price and the quantity for that market. the same level of total output will be supplied. This is the same equilibrium output level. the total supply curve is vertical at this equilibrium output level no matter what the aggregate price level happens to be. the model cavalierly does away with fluctuations in output. Y*. A change in the aggregate price level does not disturb the relative price relationships between all pairs of goods. the aggregate price level doubles as well. The traditional Keynesian approach leaves us without a theory of price determination. that we discussed in Chapter II. In Chapter II. we used the quantity adjustment paradigm as an argument for very short-run price stickiness. Moreover. no relative price between pairs of goods changes. The vertical classical total supply curve can be understood if we imagine that the aggregate price level doubles. Therefore. and thus the equilibrium level of output supplied remains unchanged. If every price doubles in terms of the money unit of account in the economy. A more appropriate view of the total supply curve will be the middle road—a positively sloped total supply curve. Thus. As long as relative prices stay in equilibrium. The level of output supplied is simply the aggregate of all these outcomes for any overall price level. By assuming that competitive markets at all times generate equilibrium levels of output. but at the cost of eliminating an explanation of fluctuations in real output. The classical vertical total supply curve and the Keynesian horizontal total supply curve represent two theoretical extremes. the total supply curve in the classical model is vertical.Figure 4 Long-Run (Classical) Total Supply Curve
S
P
D
Y*
Y
The classical view of macroeconomics is rooted in the idea that the macroeconomy is the aggregate of an infinite number of perfectly competitive markets. There are some additional reasons why price adjustments occur slowly so that over the
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. This is the case because each and every market equilibrium determines the relative price of the good in that market.

They would lose the compensation for any job-specific skills when they change jobs. Implicit labor contracts is a term that refers to the type of agreements that are often made between employers and employees.
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. First. (Thus. a new boss. a job change imposes both real and psychological costs on the worker. do not leave for alternative positions.) Of course. who are already earning a premium. Second. Most everyone agrees that such frequent wage setting behavior would be a waste of resources. We will begin with some additional reasons why prices are slow to adjust in the medium term. Examples of such forms of compensation are extra pay for seniority. This is important to employers because finding able workers and providing training can be expensive. and additional vacation time that accrues with seniority. which may be largely specific to a particular firm or job. pension rights. We observe that throughout the economy wages are usually set for relatively long periods. In addition. the negotiations take place about once a year. However. and new coworkers. these arrangements are not always permanent and layoffs do occur in recession periods. Implicit contract theory stems from the observation that firms often do not vary employment levels when demand shifts. Career Labor Markets The career labor markets view is another reason why wage rates do not vary very often. In fact. consider labor contracts that are often made with highly experienced and valued workers. People are typically reluctant to change jobs because of the uncertainties associated with a new work place. It is common to pay experienced workers more than they could earn in another job in order to decrease the probability that a firm’s experienced workers will leave. To begin. Employees get some certainty about their job security and employers get a contractual commitment to pay a fixed wage. experienced workers are compensated for their additional skills. the implicit contract arrangements seem to be common and seem to be satisfying to employers and employees alike. wages are somewhat unresponsive to changes in demand conditions. Thus. Nevertheless. Instead. The major implication of implicit contractual agreements is that they provided us another reason why wages do not vary very often. employees find it in their interest to agree to such arrangements. Why is this the case? First. Such compensation arrangements are feasible for two reasons. Such an approach is relevant for adjustments that occur for longer periods than the Keynesian short-run period (the 6 to 12 month period where quantity adjustments are dominant) and less than the long run (the period of several years after which the long-run equilibrium approach is dominant). In all likelihood. Formal wage contracts frequently cover a two or three year period. employees often value some certainty about their wage and employment situation which longer-term agreements bring. the employer does not have to pay premium wages in boom times to retain workers. Such arrangements shift the risk of economic fluctuations to employers. these negotiations are unlikely to occur anew every morning at the start of the workday. Some More Reasons Why Prices are Sticky Labor Contracts Many readers of this note have jobs and have had the experience of negotiating a price for their labor services—a wage rate or salary. The idea here is that employers adopt policies that promote the long-run attachment of workers to the firm.medium-run the total supply curve has a positive slope. Informal wage setting agreements usually stipulate an annual review or renegotiation. part of the compensation that is available to experienced workers is often only available to workers with experience and will often disappear if the worker leaves. Some examples will show how career labor market arrangements work and why they lead to slow or sticky wage adjustments. employees have implicit job guarantees at fixed wages. These include the costs of job search and relocation and the psychological burden imposed by a change in work environment. There is an additional reason for the allegiance of experienced workers to an existing job. increased labor market tightness puts only minimal pressure on the wage rate because experienced workers. Second. That is. daily negotiations would place a costly burden in terms of time and effort on both employers and employees.

the total supply curve should be drawn with a positive slope that indicates gradual upward pressure on prices when output exceeds the long-run equilibrium and vice versa. Note that the conclusion that wages are sticky in the short and medium run does not imply that they are unchanging. Wages are sticky. With high entry-level wages. they do not respond very quickly to changes in demand and supply conditions. In both instances. In fact. for medium run time periods (say.
Figure 5 Medium-Run Total Supply and Demand Curve
P
S
D
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. Thus. we discuss the effect of shock or disturbance on the macroeconomic supply and demand equilibrium. Our quick analysis shows why such arrangements are attractive. As a consequence. In the next section. wage setting for experienced workers and wage rates for entry-level positions. The important macroeconomic implication in both instances is that wages do not change very often. Such a situation is shown in Figure 5. the Keynesian assumption of constant prices is applicable for short-run periods of up to 6–12 months. price adjustments occur but they occur slowly. The earlier discussion (in Chapter III) of the quantity adjustment paradigm suggested that goods prices (at least for non-perishables) are fairly constant in the short-run. Thus. about 6 months to several years). Firms often maintain relatively high entry-level wages so there is always a normal queue of new job seekers. specific institutional arrangements tend to emerge in many firms over time. when demand conditions dictate an expansion of employment there is a queue of job seekers that can be tapped without increasing wage rates. This discussion of wage determination indicates that wage rates are very slow to adjust to changing macroeconomic conditions for periods of time that extend beyond a year.Next. the human resources department will always have a pool of able workers available for hire. consider wage rates for entry-level jobs.

the price increases offset to some extent the initial monetary policy expansion. If the initial economic conditions were one where there was plenty of excess capacity in the economy. there are both output and price increases. the former description may be more appropriate. Continued upward pressures on prices would lead to a contraction of real money balances. Quantity adjustments become less common and price adjustments become more common. There is excess demand in the real sector. The price level begins to rise and the economy begins to move toward point C in Figure 6. Nevertheless. If the economy were at its long-run equilibrium level of output to begin with. output begins to expand (the multiplier process) toward point B in Figure 6. Thus. the price increases caused by the expansionary policy may be quite large. additional output is forthcoming. real money balances decline. we will consider the case of an expansionary monetary policy that shifts the total demand curve to the right. As prices rise. capacity constraints. the multiplier process that leads to an increase in output also leads to increases in prices. we review the short-run Keynesian adjustments (from Chapter III). The increase
•
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. The fall in real balances can then have a serious constraining influence.and long-runs can be quite complicated. The difference between an expansionary monetary policy that has a substantial effect on output and little effect on prices and one that has just the opposite effects depends on the situation. the policy expansion would lead to only a temporary increase in output. shortages. Price pressure would continue as long as output exceeded the equilibrium level (by definition there is excess demand pressure in such a situation). Within a year or so. However. If bottlenecks. This expansion begins within about six months and continues for two years or more. price pressures begin to emerge because some markets begin to experience excess demand and price adjustments become more frequent. we can consider the Keynesian analysis of Chapter II. In this section. short-term adjustment situation. A Policy Expansion: Step by Step Macroeconomic adjustments in the short-. The monetary policy expansion leads to a fall in interest rates which gets the multiplier process under way and output increases.. and the policy might have led to little growth in output. and after a period of several years. if there is plenty of excess capacity in the economy and producers can readily respond to increases in demand by increasing output. there are other effects to consider. etc.A DEMAND SHOCK Consider a disturbance or shock to equilibrium that originates on the demand side of the economy—a demand shock. Specifically. Over time. the medium-term adjustments introduced here and the long-term equilibrium (from Chapter II) with a step-by-step story. What happens after the demand curve shifts—first. medium. then in the medium-run and the long run? For the short-run. Why? As output increases some markets (for some goods or raw materials) begin to encounter bottlenecks or capacity restrictions. come into the picture rapidly when the multiplier expansion gets underway. On the other hand. which bring the level of output back to the long-run equilibrium. Consider an expansionary monetary policy: • The expansionary shock shifts the total demand curve in Figure 6 from D to D’. in the short-run. Since we are no longer restricted to a fixed price. such long-run adjustments can take place slowly—over a period of as much as 3 to 5 years. the new equilibrium can involve a healthy multiplier response with little upward pressure on prices.

• This process goes on until the economy returns to a point of long-run equilibrium. Y*. As wages “catch-up” with prices.
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. With a higher price level. If output is greater than the natural equilibrium level.
Figure 6 Effect of Policy Expansion
P
S’
S
E
C B A
D’
D
Y
Additional changes occur in the medium-run. Y*. Such an effect on the output supply decisions of producers is reflected by a move back in the Supply curve to S’. As the price level continues to rise. then some markets continue to experience excess demand pressures and price increases continue. Specifically.in prices constrains the expansion because the real money supply falls as the price level increases. over time we expect that new wage contracts will be negotiated at higher wage rates. Price pressures will continue depending on the relationship between the level of output and the long-run equilibrium level of output.
•
FG M IJ H PK
falls and causes
There are yet some additional adjustment issues to consider. Y*. Output begins to fall as producers encounter higher labor costs. the level of output to move towards Y*. the equilibrium wage will also increase over time. the whole process under discussion can lead to changes in the long-run equilibrium level of output. As wages catch up. firms will no longer be willing to supply output in excess of the long-run equilibrium level. Such long-run adjustments can take 3 years and can go on for substantially longer. That is. Recall that the long-run equilibrium is the level of output where supply and demand in all individual markets balance so there are not pressures for change on either prices or production. The macroeconomic equilibrium is now point E in Figure 6. which will have further implications on macroeconomic equilibrium: • After a year or more. wage negotiations occur and wages begin to catch up with prices. supply decisions begin to change.

in particular. the policy goal for the unemployment rate for about two decades placed the output level about Y* and helped generate an era of sustained inflation. Specifically. there is a supply side effect which increases Y* and can therefore lead to a long-run output effect of the expansionary shock. Our inflation equation will also help us understand one of the most unusual characteristics of
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. The term does not convey a value judgment that this equilibrium is desirable or good. policy will have a built-in inflationary bias. In order to explore the implications of inflation in more detail. This is important. natural. A frequently stated goal for the real sector at that time was an overall unemployment rate of about 4 or 5 percent. Thus. experience and most empirical studies suggest that supply side effects are much more modest. and growth. there is an absence of inflationary or deflationary pressures at this output level. there would have been more investment expenditures than would have occurred otherwise. economy unless the unemployment rate is higher than that. An issue of considerable controversy is whether these supply side effects on Y* are very large. The supply side policy advisors in the early years of the Reagan administration argued that the shift in Y* would be enormous. several years of increased investment expenditure could have a significant impact on the level of real output associated with natural equilibrium. then the capital stock will expand. UNDERSTANDING INFLATION MOMENTUM Since the inflation rate is probably the most closely followed macroeconomic phenomenon. It is an output level associated with balance in the macroeconomy. It is very important to add that this output need not be one where all resources are fully employed. If the across-the-board tax cuts really could have enormous supply side effects on investment. It could very well be that modern economies begin to generate pervasive inflationary pressures when there are still considerable amounts of resources available. economy in the 1960s and 1970s. the natural equilibrium may not be a socially desirable goal for the economy. (We will discuss more recent estimates of the natural rate in the next section. The long-run equilibrium is “natural” because the economy tends to move toward it. The similarities between the Dole campaign and the rhetoric that came out of the Reagan White House in 1981 are striking and no more realistic this time around.
Thus. inflationary pressures exist in the U.S. Although the economy returns to a natural rate of output Y*. it will be helpful to have a theoretical framework that concentrates on the determination of the inflation rate directly. Thus. we will develop a somewhat different approach to our theoretical discussion. instead of total supply and demand analysis to determine output and the price level. The idea reappeared in the 1996 Presidential campaign when Dole suggested tax cuts that were predicted to lead to enormous increases in the rate of growth of output. A major theoretical point of our discussion is the tendency to return to a long-run equilibrium—the normal. Most econometric estimates suggest that at that time the natural rate of unemployment (the unemployment rate associated with output at Y*) was probably in the range of 6 or 7 percent. the final element of the story is: The several years of output expansion leads to growth in the capital stock. If society sets as its policy goal an output level which exceeds Y*. That is. there would be additional government revenue and the tax cuts would not increase the deficit. However. because growth in the capital stock will shift the natural rate of output upward. capital stock. or long-run equilibrium level of output termed Y*. If additional investment occurs. There may be more unemployment at Y* than a democratic society would like to endure. we will develop an equation to explain the rate of inflation in the next section. This possibility creates a serious quandary for decision-makers.) Thus.S.•
The initial expansion in output from point A in Figure 6 resulted in several years of increased output and a possible change in the composition of output. However. Such a situation may have befallen the U.

As the level of output rises about Y*. To begin. The momentum of inflation kept the inflation rate near 10% for another year before the output gap began to affect price setting behavior. Nevertheless. inflationary pressures emerge and increase with the size of the gap between Y and Y*. from 1950 to 1969. the –1 subscript (e. at Y* there would be no pressures for either quantity adjustment or price adjustments. we will examine inflation by developing a dynamic specification of price adjustments. In general. That is.. An empirical Phillips curve relationship is shown in Figure 7. P-1 ) indicates that it is the value in the prior time period. there can be a short-run equilibrium between aggregate demand and output at a level of output different than Y*. it was clear. Policy-makers were hesitant to respond with an easier policy stance because the inflation rate was accelerating at the same time. Phillips Curve The term Phillips curve refers to the empirical relationship between wage or price inflation and the unemployment rate.S. Thus. in early 1990. if output exceeds Y*. we will discuss the momentum to inflation. Y – Y* goes down. the inflation rate increases with the gap between Y and Y*. We will replace the static total supply curve with a specification of a dynamic price adjustment function. the price adjustment function relates the inflation rate to the gap between actual output and the long-run equilibrium level of output:
π = γ ( Y − Y*)
(1)
where π = is the inflation rate. Just remember that as U goes up. The momentum of inflation has important consequences for policymaking. but not entirely certain. the relationship has been extended and developed into an important analytic tool for understanding the inflation process. For example. For example. As Y grows there will be fewer markets where quantity adjustments are feasible. it was clear that the level of output was far less than Y* and had been so for well over a year. The price adjustment equation (1) reflects the influence of both supply and demand phenomenon on the inflation rate. in 1982 when the unemployment rate approached 10%. there will be upward pressures on prices. over the long run. In this section.g. there are not inflationary pressures. However.
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. Consequently. the output level will tend back to Y*. there will be more and more sectors of the economy where quantity adjustments give rise to price adjustments. A price adjustment function will help us analyze the inflation process more closely. that the economy was approaching a downturn. For example. It shows the relationship between the unemployment rate for all workers and the rate of price inflation (in the implicit price deflator for personal consumption expenditures) in the U. Since Phillips’ early econometric studies in the 1950s. It is common to present the Phillips curve with the unemployment rate instead of the gap between Y and Y*.inflation—its persistence. the inflationary pressures that developed in the 1970s persisted with little sign of abatement. Of course. An important implication of this specification of equation (1) is that when Y = Y *. Price Adjustment Function The natural rate or long-run equilibrium level of output—Y*—was defined (see Chapter II) as a point of overall market equilibrium.

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. either of which indicate the strength of economic activity and the extent of slack in the economy. A cornerstone of the Kennedy-Johnson economic program was a large reduction in personal taxes enacted in 1964. considerable latitude exists in the American economy to increase output by bringing unemployed labor and unused capital back to work: this is a principal reason why a tax reduction is needed. Indeed. In the next section we introduce the expectations augmented Phillips curve which will enable us to understand the relationship between unemployment and inflation shown in Figure 8 and also explain the persistence of inflation. In 1966–1968 the average values were 3. Figure 8 shows a scatter of data for unemployment and inflation rates for the period 1950–1987. as the breakdown of the Phillips relationship became apparent. demand for labor can expand substantially without resulting in much additional pressure on labor markets. That is.84): At present. The overall supply and demand conditions are measured in the Phillips curve analysis by the unemployment rate or the Y – Y* gap. contributions by Edmund Phelps and Milton Friedman led economists to focus on the role of the expected rate of inflation. economists struggled with attempts to explain and understand the phenomenon. The inflation-unemployment relationship for the 1950s and 1960s lies along the single smooth Phillips curve shown in Figure 7 because in this period. As the expected rate of inflation changed. In the late 1960s. the relationship between inflation and unemployment changed as well. an expansionary policy can reduce unemployment without increasing inflationary pressures very much. Throughout the 1960s and 1970s. However. A given degree of slack will result in a higher or lower overall inflation rate depending on how much inflation the price-setting agents expect to occur. Typical of such discussion is the following from the Economic Report of the President. the inflation rate was relatively low and agents generally believed that it would continue to be small. the influence of market supply and demand on the inflation rate that emerges will depend as well on the expected inflation rate. the Phillips curve shifted.5 percent in 1962–1964 and the inflation rate for personal consumption expenditures averaged 1.7 percent for the unemployment rate and 2. These data indicate that the world is more complicated than the simple Phillips curve would suggest. given the present high unemployment rate. Expectations of Inflation Economic agents who set prices are affected by two major influences.In the 1960s policy-makers were confident that the relatively flat Phillips curve (such as the one shown in Figure 7) could be used to describe their options. The economic expansion that occurred in the 1960s pushed the economy into an overheated situation in a few years. The first is the overall supply and demand conditions in the market and the second is the rate of inflation that these agents expect to prevail in the economy. Policy-makers believed that the Phillips curve provided an estimate of the trade-off between unemployment and inflation.
The gradually sloped Phillips curve relationship shown in Figure 7 for the early postwar years disappears when we add more recent data. the unemployment rate averaged 5. The inflation rate accelerated from year to year and agents began to change their expectations of inflation. Throughout this period the expected rate of inflation was both very small and relatively unchanging. If the Phillips curve is flat. The experience of the 1960s gives rather strong support for the idea of a Phillips trade-off: • An expansionary policy could reduce the unemployment rate at the cost of only a small increase in the inflation rate. an expansionary policy would reduce unemployment but would also lead to a higher inflation rate. 1963 (p.1 percent per year.8 percent for the inflation rate. While the record of the postwar years indicates that wages tend to rise more rapidly in years when unemployment is low.

.

Curiously. Y*. this story makes use of the Keynesian assumption that wages tend to be sticky.” American Economic Review. The parties in a particular negotiating session will be influenced by supply and demand conditions in the market and also by their expectations of aggregate inflation. p. The optimistic views of the trade-off expressed in the Economic Report of the President. The expectations-augmented Phillips curve indicates that the attractive short-run trade-off is only a temporary phenomenon. However. prices also begin to move upward. over time as workers perceive the changes in real wages that have occurred. wages do not increase as quickly. labor supply adjusts. Friedman concluded his view of the Phillips curve trade-off by stating: “There is always a temporary trade-off between inflation and unemployment. In the long run. the
1
Milton Friedman.1 as follows: “Implicitly.The so-called trade-off between inflation and unemployment that had been observed in the 1960s turned out to be not so favorable. there is no permanent trade-off. However. 1963 quickly disappeared. Furthermore. a trade-off between inflation and unemployment (or output)— the Phillips curve trade-off—exists as long as workers do not perceive what is happening. Thus. After a while. The temporary trade-off comes not from inflation per se. additional labor supply is forthcoming because workers do not perceive the real wage decline. output increases. nominal wages move slowly relative to prices.” Friedman’s development of the Phillips curve analysis has the important implication that there is no permanent way of trading off unemployment for inflation. Economists soon realized that the Phillips curve model had to be expanded to include the role of expectations of inflation. “The Role of Monetary Policy. March 1968. as output increases. real wages fall and employment increases as employers move along their downward sloping demand for labor curve. there is no trade-off. Therefore. As employment increases. The intuition underlying the natural rate Phillips curve was presented by Friedman in terms of the labor market. wages will rise at the same rate to maintain real wages and labor market equilibrium. Consider a situation where aggregate demand expands. The price or wage agreement that emerges from the negotiations will be higher if both parties expect more inflation to take place in the overall economy. they adjust their expectations of inflation. In the long run the unemployment rate will tend towards the natural rate or the unemployment rate (see Chapter I) consistent with long-run equilibrium. This new view was forcefully presented by Milton Friedman in his 1967 Presidential Address to the American Economic Association.. The relationship between the short-run and long-run trade-off can be illustrated by developing an augmented price adjustment equation that includes the role of inflationary expectations. Augmented Price Adjustment Equation The effect of an increase in expectations of inflation on the actual rate of inflation can be seen by envisioning a particular price or wage negotiation. A rising rate of inflation may reduce unemployment. if more inflation is expected. a higher rate will not.. there is some nominal wage stickiness in the short and medium-run. There is a general misperception of the real wage decline for some period of time. Thus.” Friedman went on to note that if inflation is anticipated.8. and the labor market returns to its equilibrium at the natural rate of unemployment. Phillips wrote his article for a world in which everyone anticipated that nominal prices would be stable and in which that anticipation remained unshaken and immutable whatever happened to actual prices and wages.. that is. which generally means from rising inflation . workers realize that inflation erodes real wages and they adjust their expectations and negotiating behavior accordingly.
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. but from unanticipated inflation.

expected inflation should adjust to the actual inflation rate. To develop the long-run trade-off. This suggests the following specification of the expectations-augmented price adjustment equation:
π = γ ( Y − Y*) + β π e
(5)
where π e is the expected rate of inflation and the coefficient β measures the impact of expectations on the inflation rate. Equation (5) represents a family of Phillips curves. there is a trade-off relationship between the inflation rate and the output gap (or unemployment rate) for each level of expected inflation. The inflation rate that emerges from price setting throughout the economy will depend on both supply and demand conditions and the decision-makers’ expectations of inflation. recall that changes in the actual inflation rate are likely to be associated with changes in the expected inflation rate as well.
Figure 9 Long-Run Tradeoff
π
π2
C
Inflation Rate
B
π1
D
πe
A
2
π0 πe
0
πe
1
Unemployment Rate or Output Gap
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. the long-run trade-off is steeper than the short-run curves. With this in mind. we know that a characteristic of long-run equilibrium is that actual and expected inflation rates are equal. The expectationsaugmented Phillips curve is illustrated in Figure 9. The condition that defines the long run is:
π =πe
Substituting the long-run equilibrium condition (6) into (5) yields:
(6)
π=
γ (Y − Y*) 1− β
The slope coefficient on the output gap is γ /1− β . Over time.bargainers are likely to settle on a higher price even with supply and demand conditions unchanged. π e . since β < 1 . Ultimately. the expected rate of inflation changes and the longer-run trade-off curve is given by the steeper line shown by ABC in Figure 9—a long-run trade-off. A flat trade-off curve is shown for each level of the expected inflation rate.

The economic importance of the distinction between the long-run and short-run Phillips curves can be seen by reconsidering the expansionist policy recommendations of the early 1960s. The Keynesian economists of that era viewed the trade-off between unemployment and inflation as relatively flat and thought that a policy expansion would move the economy along to higher output with little effect on inflation. That is, as the economy expands, bottlenecks and inflationary pressures emerge and the inflation rate increases as the unemployment rate falls. However, the early Keynesians overlooked the fact that as inflation increases, expectations of inflation will increase as well. The long-run trade-off in Figure 9 is drawn with the assumption that β < 1 . This implies that expectations do not have a full impact on inflation. The true long-run is reached when all adjustments to change have taken place. If all the long-run adjustments have occurred, we expect that the bargaining process that determines wage and price inflation should fully reflect the expected inflation rate. In this case, a change in π e has a one-for-one impact on the inflation rate, π , in the long run. In this view, β < 1. With a full impact of expectations, the expectations-augmented price adjustment equation should be written as:

π = γ ( Y − Y*) + π e
If we now solve for the long-run trade-off by substituting the long-run condition π = π e , we get: Y = Y* In the long run, after all inflation adjustments have taken place, there is no trade-off between output and inflation; output simply returns to the natural level, Y*. The relationship between inflation and the output gap or unemployment rate is shown in Figure 10. The long-run trade-off is given by the vertical line. Thus, the long-run equilibrium in this analysis is the same one developed in Chapter II.

c

h

Figure 10 Natural Rate Phillips Curve

π

Unemployment Rate or Output Gap

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Friedman’s view is often called the accelerationist approach because of one of its major implications. That is, to keep the unemployment rate below the natural rate requires an increasing expansionary stimulus and a continuously rising inflation rate. If the initial policy change that moved the economy from A to D in Figure 9 was an increase in the rate of growth of the money supply, the growth rate must be continuously increased in order to prevent a return to the natural rate of unemployment. An accelerating rate of inflation would keep wages lagging behind prices, keep the real wage below its overall equilibrium, and maintain an unemployment rate below the natural rate. The unemployment level associated with Y* is called the natural rate of unemployment; it is not directly observable and the value of the measured unemployment rate that we call the natural rate might change over time. The Economic Report of the President, 1983 states that “... while it is not easy to pinpoint the inflation threshold unemployment rate precisely, it probably lies between 6 and 7 percent.” In the 1990 OECD Economic Surveys: United States, the Organization of Economic Cooperation and Development reports that: “Estimates of the unemployment rate at which inflation would stabilize—the so-called natural rate—vary from about 5 to 7 percent. Wage behavior has been restrained enough in the last decade to suggest that the natural rate is in the middle of the 5 to 6 percent range—an improvement in the 1970s probably due in part to an older and more educated work force, greater confidence that inflation would not be allowed to accelerate and improved productivity growth. But it is still higher than that which was obtained in the 1960s, when wages tended to accelerate only when the unemployment fell towards 4 percent.” The actual employment rate was at least 7% in every year from 1980 to 1986 and the inflation rate declined steadily over this period. The unemployment rate declined rapidly from 7.0% in 1986 to 5.5% in 1988 and 5.3% in 1989 and the inflation increased during this period. More recently, there has been considerable controversy about the natural rate of unemployment. From mid-1994 through 1996, the unemployment rate in the U.S. has been consistently less than 5.5 percent. The Congressional Budget Office’s estimate of the natural rate of unemployment is 5.8 percent. Thus, there has been serious concern about the start of inflationary pressures. However, the inflation rate in the CPI has remained around 3 percent. In early 1997, policy-makers adopted a more restrictive policy that would reduce the rate of economic growth (real GDP grew at an annual rate of around 4.5% in the first half of the year) and keep the unemployment rate from dipping any further below the estimated natural rate. Such a policy would be a preventive measure, designed to stave off the inflationary pressures that are deemed to be inevitable sooner or later with the unemployment rate below the natural rate. The consensus interpretation of the economic situation, however, has been challenged by many observers. These economists note that the unemployment rate has been below the estimated natural rate for some time without there being any evidence of inflationary pressures. Rather than concluding that increased inflation is just around the corner, they conclude that the estimates of the natural rate of unemployment must be mistaken. This approach argues that structural change in the economy and in labor force behavior imply that there can be lower unemployment and more growth without the danger of inflationary pressures. Indeed, to make policy restrictive when the unemployment rate is still above 5% would unfairly rob the U.S. economy of its growth potential. Readers of this Chapter will have the experience of 1997 and later to help them conclude which interpretation was correct.

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Summary We have not developed three distinct views of the Phillips curve—inflation adjustment model. The first is the simple trade-off model that was used by policy-makers in the 1960s. The second was the expectations-augmented Phillips curve. With this model, a trade-off between inflation and unemployment exists in the long run, although it is not as favorable as the short-run trade-off because inflation begins to generate inflationary momentum and expectations of future inflation. The third model is derived from the assumption that expectations adjustments are complete. The full impact of inflationary expectations on inflation brings us full circle back to the long-run equilibrium model of Chapter II. RATIONAL EXPECTATIONS Our discussions of the formation of expectations have indicated that expectations adjust slowly when inflation changes. This has often turned out to be an accurate description of reality, but it is not necessarily true. Starting in the early 1970s an alternative hypothesis about the formation of expectations had a very profound effect on economic thinking. We will begin with an explanation of the rational expectations hypothesis and then examine its implications for our macroeconomic model. Although the hypothesis is at times unrealistic, its implications are important. The rational expectations hypothesis states that expectations are knowledgeable and informed predictions of the actual outcome. That is, expectations are formed by individuals with an understanding of the workings of the economy and with available information on all relevant phenomena. Expectations of inflation are thus based on all available information that relates to price determination and with an understanding of how prices are in fact determined. If expectations of inflation are rational, expectational errors will not be systematic. Any known and systematic determinant of inflation will be taken into consideration when expectations are formed. Therefore, expectations of inflation and the actual inflation rate will differ only when a nonsystematic phenomenon or random shock affects the inflation rate. With rational expectations, the expected inflation rate can be expressed as the actual inflation rate plus a random error term:

πe = π + λ
where λ is a random error term, or “noise,” which is on average, zero. If it differs from zero in any systematic fashion, expectations, π e , are not rational. With rational expectations, any systematic deviation will be observed and incorporated into the process by which expectations are formed. The rational expectations hypothesis represents the extreme position that expectations are always formed with full knowledge of how the world operates. Although factual considerations do not fully support this assumption, we will examine its implications for the Phillips curve model and policy-making. The implication of the rational expectations hypothesis can be seen if we re-write the inflation adjustment equation as:

Y − Y* = γ π − π e

c

h

and add the above definition of the difference between actual and expected inflation. The Phillips curve/price adjustment model with rational expectations, has some startling implications. With expectations formed according to the hypothesis of rationality, there is no trade-off between unemployment (or the Y-Y* gap) and inflation at all. Unemployment is equal to the natural rate plus a deviation that is purely random. By the very definition of rationality, there is no opportunity for the systematic emergence of unanticipated inflation. Only surprises that are due to random events or an unanticipated policy change can lead to an inflation rate that differs from the expected rate. Thus the unemployment rate differs from the natural rate only when there is a shock or surprise. Furthermore, such

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Put succinctly. they will use their knowledge of how such a policy affects the economy. a fully anticipated policy will have no effect on the level of real economic activity. though. expectations of inflation will adjust immediately and the new equilibrium will be established immediately. Only by systematically fooling the public can policymakers force the unemployment rate to deviate from the natural equilibrium. Of course. an effective policy must be unanticipated. The rational expectations theory has been presented here as a particular hypothesis for the formation of expectations in a natural rate Phillips curve model. However. but it turned out to be a permanent change in the relative price. That is. unanticipated inflation is always a random or unpredictable phenomenon. a major building block in a whole class of macroeconomic models that can be termed the new classical approach. economic agents may have an imperfect understanding of the workings of the economy.” If the policy is not fully anticipated. There may be some reasons. the natural rate Phillips curve indicates that there is a unique and stable natural unemployment rate. why the public may be fooled into making errors in forecasting inflation. It is. and policy goals. natural rate) model. It is important to note that the policy ineffectiveness proposition is a consequence of two elements of the model structure. New Classical Macroeconomics The natural rate Phillips curve model implies that the unemployment rate differs from the natural rate when inflation is unanticipated. As long as expectations are an informed forecast which utilize the actual structure of the economy. real-sector effects do occur. With rational expectations. economic conditions. all deviations. including short-run deviations. However..g. The OPEC oil-price shock could be viewed in this way. Policy-makers may have better and more up-to-date
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. Therefore. some shocks seem to persist longer than the rational expectations hypothesis would suggest. The change in energy prices was thought at first to be a temporary change associated with the oil embargo. second. Second. their information may be limited. First. In our model with a natural rate. The immediate adjustment of π e to all the implications of the policy expansion has eliminated the distinction between the long-run and short-run response.deviations must be short-lived since a surprise cannot last beyond the current period. If the policy is known to economic agents. it will be able to forecast the inflation rate. where inflationary expectations are formed rationally. the unemployment rate will differ from the natural rate only if there is a policy surprise. we have the startling and troublesome implication that “policy doesn’t matter. The policy implication of rational expectations can be seen by considering again an equilibrium disturbed by an expansionary policy. such effects must be short-lived because economic agents will respond and adjust their expectations as soon as the policy becomes apparent. If the public is well informed about the economic structure. If expectations are formed rationally. of the unemployment rate from the natural rate are random events. a shock may appear to persist because its magnitude and extent were also a surprise. First. however. an expansionary policy leads to inflation and does not change the natural rate equilibrium. A policy which surprises the public can lead to an error in inflation prediction and a deviation of the unemployment rate from the natural rate. expectations are formed rationally. In the next period it becomes part of the available information set used by economic agents to determine π e rationally. Hence the policy ineffectiveness proposition of the rational expectations school: In an equilibrium (e. with complete knowledge of the underlying equilibrium structure and all relevant information. That makes it impossible to set a policy that makes the unemployment rate differ systematically from the natural rate.

If the money supply is growing less rapidly than the price level. The distinction among the different sources of inflation is somewhat artificial because they can all be present and are often related to one another. P the price level. We can view velocity as the rate at which the money stock turns over in order to generate some level of nominal income. which will over the long run remove the inflationary pressures. called velocity.information about the structure of the economy. The sources examined are: • • • • • monetary growth excess demand relative price shocks wage-price spiral or cost push expectations
Monetary Growth The first thing to note is that a sustained inflation cannot be maintained forever without monetary expansion. This proposition has very important real-world implications. The policy ineffectiveness proposition has had a profound effect on our understanding of what macroeconomic policy can accomplish. it is a functional relationship between the money stock and nominal income: MV=PY where M is the stock of money. In addition. Deviations of the unemployment rate persist for much longer periods of time than the rational expectations hypothesis suggests. The proposition is as follows: In a model where expectations of inflation are based on all available information and formed with an understanding of the structure of the economy (i. different inflationary episodes can be often be ascribed to a particular dominant causal factor. It is often called the policy evaluation or uncertainty proposition. the policy-makers may be able to fool the public by pursuing an expansionary policy without saying so. SOURCES OF INFLATION In this section we will review the phenomena that generate inflation and maintain its momentum. Y real output and V. expectations are rational). More appropriately termed the quantity identity. the usual context for examining the relationship between inflation and money growth is the quantity theory of money that was developed in Chapter II. is defined by the relationship.
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. it implies that it may be impossible to use discretionary policy to guide the economy because the implementation of policy alters the responses. Nevertheless. PY. the responses of the economy to economic policy initiatives are variable and uncertain. institutional constraints such as long-term labor contracts may lead to expectational errors. the implications of the rational expectations Phillips curve are important. Finally. Unless monetary policy accommodates the ongoing inflation. There is an additional lesson to be learned from the new classical approach.. However . Nevertheless. More generally. This proposition is not as unrealistically strong as the policy ineffectiveness proposition. monetary policy is contractionary and will ultimately pull the economy into a slowdown.e. then the stock of real money balances (M/P) is declining.

The common examples are weather conditions that can affect the prices of agricultural products and change in the prices of raw materials like the oil price shocks of the 1970s. the % ∆Y is determined by technology and growth in the labor force and capital stock. the shock is likely to be accommodated. many firms determine the prices of finished goods (at least in the short-run) by adding a markup onto costs. which leads to the price increases spreading through the economy. if there is excess demand and limited availability of capacity and other productive resources. The trend is increasing because technological improvements in the financial system have increased the rate of turnover. However. in the long run. Furthermore. In the short-run. inflation % ∆P . then price adjustments will dominate. Imagine that the OPEC cartel is once again able to impose a large increase in the price of oil. Thus. Since policy-makers are anxious to avoid recession. expenditures on energy increase and less income is available for other expenditures. Thus. Over long periods of time. Thus. the initial shock raises prices and leads to monetary accommodation. wage setting behavior (in both unionized and non-unionized sectors) tends to reflect changes in the cost of living or the aggregate inflation rate.To discuss inflation. Excess Demand The major thrust of our theoretical model (the total supply and demand framework) is that disequilibrium between output and demand leads to quantity adjustment and price adjustments. If monetary policy does not accommodate the price shock. Relative Price Shocks Relative price shocks have on occasion had a major impact on the inflation rate. In particular. In all likelihood. Supply shocks can have a lasting effect on inflation. examine the quantity equation in terms of growth rates:
% ∆M + % ∆V = % ∆P + % ∆Y
Our earlier examination of money demand indicated that velocity—the speed of turn over of money balances—will vary with the level of interest rates. Thus. there can be wide variations in monetary growth which have little apparent impact on the inflation rate. monetary policy will accommodate the price increase from the initial shock and increase the money supply. A relative price shock is a sudden change in the price of particular goods that play an important role in overall production. in the long run we can view the % ∆V as constant. is determined by the rate of monetary growth. The price of energy increases and this effects prices generally. Furthermore. velocity varies around an increasing trend. In addition. we expect that quantity adjustments would be dominant. in the long run the economy reverts to Y* and the long-run rate of growth of output is the rate of growth in Y*. the economy will contract into a recession.
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. When there is available productive capacity. However. We already analyzed such supply shocks that can reduce the level of output and increase prices. Wage Price Spiral The momentum of inflation is hard to break because price increases will be quickly passed around the economy from one price sector to another. over long periods of time there is a very strong correlation between inflation rates and monetary growth rates. This is the reason for the adage often suggested by monetarists that ‘inflation is a monetary phenomenon’.

long-term rates moved very little and the impact on investment expenditures is likely to be fairly small. For example. Any inflationary shock that enters the spiral of price and wage setting can effect the process for years. the move towards an easier monetary policy between mid-1990 and early 1991 reduced short-term interest rates by almost 2 percentage points. but it may not affect the long-term interest rates that are relevant for investment decisions. Inflation expectations have a strong influence on the actual rate of inflation. Inflationary expectations may be unaffected because of the lack of credibility of the anti-inflationary policy. the interest rate relevant for decision making is the ex ante real rate. At the same time long-term interest rated declined by only one-half of a percentage point. then we would not expect the change in interest rates to have any implications for behavior.The combined influence of markup pricing and the cost of living on wages means that inflation has a great deal of momentum. The reason for this is simply that financial market participants did not expect the easing to be permanent and over the long-run expectations of inflation still persisted. Although the expected real rate of interest is difficult to measure.
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. Thus. Inflation Expectations Another element of the price setting spiral is the role of inflationary expectations. In addition. The response depends on how economic agents interpret a given change in nominal interest rates. However. inflation expectations can be very slow to change. If all economic agents shared this expectation. economic theory tells us that it is the relevant determinant of behavior. then the expected real return is unchanged. As a consequence. That is. Inflation expectations are important for examining inflation for another reason as well. Even in the presence of large changes in demand. then expected inflation might not change when the economy enters a slowdown. A policy-induced contraction can have only a minor effect on the inflation even in the presence of considerable excess capacity because of the resilience of expectations. expectations of inflation are not likely to be shared by all economic agents. These measures may or may not change when there are changes in the observed nominal interest rate. the momentum of inflation driven by expectations can be a very important determinant of the inflation rate. Thus. A decrease in nominal interest rates will increase investment expenditures if it is perceived to be a decrease in the real rate of interest. If nominal interest rates rise from 5% to 10% and at the same time expected inflation rates increase by the same amount. For example. the momentum of the inflation process goes on for some period of time. An easing of monetary policy will have an immediate effect on short-term interest rates. all of our discussions of the effects of interest rates on expenditure decisions must be qualified. If economic agents do not think that the policy-makers will stick to anti-inflation policy. We now understand why the response of expenditure to changes in interest rates can be so unpredictable and variable. the decision to make a capital investment will depend on the expected real return from the project and the expected real cost of financing.

MONEY AND MACRO POLICY In this chapter. M1.) As a result. at your local ATM when you transfer funds from a savings or money market account to a checking account or to cash. it creates a new asset (the loan contract or IOU) and a new liability for the bank (the increase in the bank’s deposit balances). 1 Reserves are held for two reasons. monetary policy and the growth of the money stock determine the inflation rate. The use of the term reserves here should not be confused with the loan loss reserve. That is. Of course. a bank will want to hold reserves that are sufficient to meet the requests of
1
Reserves are the liquid or cash assets of the bank. First.
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. a bank’s willingness and ability to buy assets (or make loans) and increase the money supply will be guided by its profit maximizing behavior and tastes for risk. policy making has focused on monetary policy. For example. Reserves (usually in the form of vault cash or deposits at the central bank) may be required by the regulatory authorities. Thus. when a bank makes a loan it is also buying an asset—the lenders IOU—and it simply credits (increases) the lenders deposit account by the amount of the loan. good business behavior will place restraints on the amount of money creation that the bank will do. there is general agreement that in the long run.CHAPTER V BANKS. we presented the formal definition of the stock of money that is used in the United States by the central bank—the Federal Reserve System. the stock of money outstanding). it needs to maintain adequate reserves in the form cash in the vault or deposits at other banks or at the central bank. Similarly. we turn our attention to financial institutions and their relationship to macroeconomics. when a bank makes a loan. Persistent government deficits and the slow macroeconomic responses to fiscal policy changes have resulted in increased emphasis on monetary policy in the short-run. In Chapter II. This was not always the case. BANKS AS CREATORS OF MONEY The most important part of the money supply is the deposit liabilities of financial institutions. Thus. and in just a few seconds. Such deposits are created by the banking institutions themselves. in the short run. Substitution between transactions assets and other components of the broader aggregates is now both very common and very easy. (You probably do it often. When we think of the money supply (that is. as policy making in recent years has emphasized the importance of maintaining a stable inflation rate that is as close to zero as possible. prior to the deregulation of bank activities and the simultaneous development of the technology for electronic funds transfers (all of which started in the 1960s and speeded up in the 1980s). Second. At the present it suffices to recall that M1 is currency and the transactions deposits at banks and other intermediary institutions. When a bank purchases an asset it pays for it by crediting the account of the seller and in so doing it creates a deposit. Thus. the principal policy responses come from monetary policy and central banks are the most important influences on monetary policy. the most commonly used definition of money was a narrow one. a part of the bank’s capital which is set aside to cover bad loans. There are two reasons why this is so: First. we will usually have an M2 aggregate in mind. monetary policy through its influence on interest rates and credit availability is the principal tool of macroeconomic stabilization policy. The broader definitions M2 and M3 add various deposit balances and other financial assets that can be converted into transactions balances with little risk or cost. The reason to devote an entire chapter to money and banking is that the monetary sector and monetary policy are currently the focus of most macroeconomic policy discussions. These non-transactions components of the broader money supply definitions are so close to being transactions assets that they are often called near-moneys. when recession or international payments crises loom. the broader aggregates are probably the best current definition of money.

000 Loans and Investments No change Total -8. deposit-issuing institutions are often required by regulatory authorities to hold reserves that are at least as great as a certain fraction of their deposits.000 Loans and Investments +8.000 Deposits +10. called fractional reserve banking. the bank needs reserves so that any depositor’s request for cash can be readily met. i. SMITH SPENDS Reserves -8. We will start with a brief examination of the money creation process that shows how a banking organization works.000.000 *MS. The cash is placed in the vault and there is an increase in the reserves (cash in the vault) and deposits of Bank A.000
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.e. Thus.000 Net Worth No change Total +8. Required reserves can be held in the form of cash in the bank’s vaults or as the bank’s own deposits at the central bank (the Federal Reserve). Second.000 Total +10. Also. to be sure that every bank has adequate reserves. TABLE 1 Changes in Bank A’s Balance Sheet Assets *BANK RECEIVES DEPOSIT Reserves +10.000 Net Worth No change Total +10. The section that follows will develop a more formal model of the banking system and money creation process that will show how monetary policy is conducted.depositors to withdraw their funds. The first is to promote the safety and stability of the banking system.000 *BANK MAKES LOAN Reserves No change Loans and Investments +8. is a key part of the money creation roles of banks.000 Net Worth No change Total -8. for the simplest possible framework. The Federal Reserve imposes reserve requirements for two reasons. The second is to control the aggregate money supply.000 Loans and Investments No change Total +10. We depict these balance sheet changes in the first panel of the T-accounts in Table 1.000 Deposits +8. In this section we will explore some of the implications for the banking business.000 Liabilities Deposits +10. Bank A experiences an increase in its cash (asset) and its deposits (liabilities) of $10. Fractional Reserve Banking Suppose that banks keep one-fifth of their deposits as reserves either as a legal requirement or by choice in order to be prepared for possible withdrawals. imagine that someone comes along and deposits $10.000 Net Worth No change Total +10. To begin.000 in currency in Bank A.000 Total +8. which shows changes in bank’s assets (on the left) and liabilities (on the right).000 **BANK A SUMMARY Reserves +2. The practice of holding a fraction of deposits in cash reserves. we will assume that the banking system always maintains exactly that ratio of reserves to deposits.000 Deposits -8. Let’s see what might happen.

Jones now has a demand deposit (in Bank B) of that amount which did not exist before. We can trace the effect of this series of transactions on the balance sheet of Bank A. Mr.400 from Bank B’s activities. Smith’s checking account. It then has excess reserves of $8. In addition. Green by that amount. The bank credits Mr. Smith. her supplier. it increased the deposits of Mr.400 that it can use to make loans and investments. That is.000 into Bank B required this bank to increase its reserves by only $1.000) and creates a demand deposit for her. Bank A is able to expand its loans and investments by an additional $8. it finds that it only needs to keep $2000 as additional reserves.000. She can then write a check to Ms. The inflow of deposits of $8. As a result of the increase in deposits of $10.Bank A realizes that it does not need to use all of the $10.000.000. the money supply has been expanded by $8.000. Stone takes the check from Mr. Suppose that the bank decides to buy $6.400.000 due to Bank A’s activities and by $6. The money supply has increased by $8.400—this amount eventually becomes additional deposits in Bank C. it simply writes up an additional balance in Ms.000 in additional cash as reserves. we follow the process to Bank B where Ms. Thus Bank B has contributed to an expansion of money by $6. Bank B then presents the check to Bank A for payment. Jones then deposits the check in Bank B. Ms. Jones has deposited the check from Ms. Green and deposits it in Bank C. When it did so. which it can use to buy other assets—make loans and investments. The bank found that it had excess reserves so that it was able to expand loans and investments by $6.000. Green’s account by $6.000 since Ms. Jones. to pay for the new inventories.400 of bonds from a depositor. A bank customer. Bank B does not need to keep the full $8. Green uses the proceeds of the sale to buy some furniture from Ms.
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.600. Ms. Ms. The bank judges this to be a good loan and it lends Ms. Smith.000 as reserves since its reserve requirements are also only onefifth of deposits.000—1.400 in return for the bonds.600 = $6. Smith the funds ($8. now comes to the bank to take out a loan to finance an increase she would like to make in her business inventories. Bank A’s activities have increased both the money supply and credit by $8. Bank B has cleared the check through the regional Federal Reserve Bank and finds that it has both deposits and reserves that have increased by $8.000. The check is cleared through the Federal Reserve System where the deposits (reserves) of Bank A are decreased by $8.000/5 or $1. as shown in Table 2. and Mr.600. In summary. Stone’s furniture store. Since it only needs to keep one-fifth of the additional deposit as reserves. We can see several things from the T-accounts for Bank B. Green. Bank B now has excess reserves of $8. Next.000 and the deposits of Bank B are increased by $8. increasing the quantity of money held by the public by an equal amount. Bank B’s increase in required reserves is only $8.

000 *BANK BUYS BOND Reserves No change Loans and Investments +6. the banking system as a whole can increase the money supply by a multiple of the amount of excess reserves. Suppose that banks hold reserves equal to a fraction.000 Net Worth No change Total +8. The net effect of the process is that the money supply will be expanded by an amount that is 1/(1 – (4/5)) = 5 times the initial increase in excess reserves. The Money Multiplier If an amount of excess reserves is made available to the banking system. k. of their deposits.400 *MS. For now. An increase in reserves (from the initial deposit of cash) has a multiplier effect on the money supply.000.400 **BANK B SUMMARY Reserves +1.000.000 at Bank A? Clearly the effect of this initial increase in deposits has spread beyond Bank A.400 Loans and Investments No change Total -6.400 = (4/5)*8. The process goes on indefinitely.600 Loans and Investments +6. which is the ratio of reserves held (because of legal requirements or as a consequence of prudent banking business) to deposits. Bank B creates money and credit equal to $6. We could continue the process by tracing through the transactions that result from Bank C’s deposit inflow of funds and see that Bank C will also be able to expand bank credit and expand the money supply.000. In this simple example—where every bank always holds exactly one-fifth of its deposits in the form of reserves—it is easy to figure out the total effect of the initial inflow of reserves on amount of money and credit created by the banking system. It was this quantity of excess reserves that started the process of credit creation and money supply expansion in motion. The process continues indefinitely. As a result of the initial increase in deposits of $10. Bank C is able to create money and credit equal to $5120 = (4/5)*6400 = (4/5)*(4/5)*8. This multiple depends on the size of the reserve ratio.TABLE 2 Changes in Bank B’s Balance Sheet Assets *BANK RECEIVES DEPOSIT Reserves +8.400 Deposits +8. GREEN SPENDS Reserves -6.000 Loans and Investments No change Total +8.000 Net Worth No change Total +8. with each successive bank in the process expanding money and credit by 4/5 the amount of the previous bank.400 Deposits -6.400 Total +6.400 Net Worth No change Total -6.000. Bank A finds that it has excess reserves of $8.000 Liabilities Deposits +8.400 Total +8. we will continue to assume that banks have only one kind of deposits and that banks never hold excess reserves or have
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.000 Deposits +6.000
What is the total effect on the banking system of the initial cash deposit of $10.400 Net Worth No change Total +6.

) consists of a portfolio of securities. The money supply consists of currency (C). the currency in circulation is a liability of the Federal Reserve. If deposits exceeded this amount. Take a look at the dollar bills in your pocket. Reserves of the banks are held in the form of deposits at the central bank (for simplicity. Total reserves (TR) are the sum of required reserves (RR) and excess reserves (RE): TR = RR + RE The assets of the central bank (the Federal Reserve or the Fed in the U. then: R = kD. banks would be holding excess reserves. we find that:
R =D k
Furthermore. If we let R be the volume of reserves of the banking system and let D be the volume of demand deposits held by the public. The central bank’s balance sheet is: Q B TR C
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. checkable (demand) deposits (D) and time (savings) deposits (T): M=C+D+T That is. We will assume that the public’s holding of currency and time deposits are both determined exogenously. the money supply is an M2—broad money—definition. banks would not be holding sufficient reserves. If deposits fell short of this amount. These deposit balances are the reserve assets of the banks and deposit liabilities of the Fed. the change in deposits for a change in reserves is:
dD 1 = dR k
If the reserve ratio is k = . they are notes—Federal Reserve notes—issued by the Fed.S. the banks do not hold any cash reserves). If we divide both sides of this equality by k. The banks are required to hold reserves that are equal to a fraction of their demand deposit liabilities: RR = k D where k is the reserve requirement ratio.2 and if the volume of reserves is 2000 than the volume of deposits must be 10. but we will call it M for simplicity.000. These deposits are total reserves TR (since for simplicity. The borrowing by banks from the central bank is denoted by B. which we call Q and loans from the central bank to banks. we will assume that the banks do not hold vault cash but deposit all their currency with the central bank). In addition. Central bank assets consist of the deposits held by banks and other financial institutions at the central bank.reserve deficiencies.

As we will see shortly. To examine bank demand for reserves. which we will consider next. RR yields: Q = = = TR – B + C RR + RE – B + C kD + RE – B + C
Finally. the Fed is able to exercise considerable control over the quantity of bank reserves. the Treasury and foreign governments will also have deposit balances at the Fed. the discount rate. The most important omitted asset is the foreign exchange holdings of the Fed. RF. is another means by which the Fed carries out monetary policy. bills. We will examine the costs and benefits of reserve positions in order to derive the demand for free reserves. We will also see that the interest rate charged on these loans. we do not include some other assets and liabilities that are actually on the balance sheet of the Fed. Each bank will manage its balance sheet differently and the overall situation for the banking system is reflected by the amount of free reserves. Some banks may wish to hold excess reserves while some banks may have deficiencies that are met by borrowing reserves from other banks or from the Fed. It will depend on the behavior of the banks. TR. The liabilities of the banking system include their deposit liabilities—the demand and time deposits of the public (D and T)—and bank borrowing from the central bank—B. For example.For simplicity. and bonds. it will be useful to have the aggregate balance sheet for the banking system as a reference: Loans Securities TR D T B
Assets of the banking system include loans and securities and the reserve deposits at the central bank. Some banks may hold excess reserves while some may be borrowing reserves from the central bank.S. The money supply function is derived from the central bank’s balance sheet identity: Q + B = TR + C Substituting the definitions for TR. this is the most important way that the Fed exerts control over the money supply and the economy. use the definition of the money supply to substitute for D and define free reserves as RF = RE – B: Q = k(M – C – T) + RF + C Solving for M. The overall position of the banking system is RF. By buying and selling securities. Loans to banks are made by the Fed to banks that find themselves short of reserves. which can be positive or negative.
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. The securities on the Fed’s balance sheet are U. gives: M = (l/k) {Q – (l – k) C – RF} + T
One additional element needs to be added to the relationship—the banking system’s demand for free reserves. government notes.

the money supply changes when the policy tools (Q. The banks determine their demand for liquidity. If interest rates are low. M s increases when the central bank adds to its bond portfolio (an increase in Q. If interest rates are high. and the banks. which supplies additional reserves). the demand for excess reserves—RE—will be decreasing with market interest rates. k. loans or securities). opposition to the concentration of economic power and the extension of federal government authority over the states emerged. if interest rates are high. Also.g. rd ) RF increases with rd and decreases with r. the central bank sets the level of the reserve requirement ratio. excess reserves or liquidity is less costly and some banks may prefer the cushion provided by excess reserves. reduces reserve requirements (k). there was no central bank to provide a loan to the banks when they had temporary liquidity problems or to influence the overall availability of reserves and the growth of the money supply. The First bank of the United States was established in 1791 by Alexander Hamilton with substantial powers over the banking system. and the country entered a period of free banking in which entry into the banking business and the expansion of credit were largely unregulated. The need for a strong central bank became apparent during the panic of 1907. reserve deposits at the Fed do not earn any interest. k. Substitution yields our money supply function: M = (l/k) {Q – (l – k) C – RF(r. We will first discuss the structure of the Federal Reserve system and then return to a full discussion of each of the monetary policy tools. Thus.
The demand for free reserves can be written as: RF = RF(r.S. in the populist era of Andrew Jackson. In the U. profit maximizing banks will have an incentive to borrow reserves (increase B) and buy more assets (loans or securities). r.S. In addition. borrowing is an increasing function of market interest rates and a decreasing function of the discount rate. These correspond to the three tools of monetary policy—reserve requirement rations. discount rate and open market operations. However. Borrowing will be a declining function of rd . as market interest rates—r—increase. RF. The National Currency Act of 1863 imposed some reserve requirements and solved the problem of not having a uniform national currency. Q. banks will be less willing to hold non-interest-earning reserves and will prefer to purchase earning assets (e. there is a substantial opportunity cost to free reserves.. Finally. An increase in demand for currency (C) absorbs reserves and decreases M s . The demand for borrowing—B—will depend on the cost of borrowing from the central bank. The charter of the central bank was not renewed. the banks will find it profitable to make more loans and hold reduce free reserves. However. The public determines its hold of Currency and Time deposits—C and T.In the U. and rd ) change or the public changes its demand for currency. r d ) } + T The money supply depends on behavior of the public. as well as central bank policy decisions. rd . and the size of its portfolio of securities. rd ) decreases as r increases. STRUCTURE OF THE FEDERAL RESERVE Early in the history of the United States there was a strong central bank. the level of free reserves. With higher interest rates.. and the Federal Reserve Act was passed in 1913. the interest rate on Fed loans to the banks is known as the discount rate – rd . Thus.
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. In summary. The money supply is an increasing function of market interest rates since RF(r. or reduces the discount rate (rd ). the discount rate.

Administer the discount window. the profits of the Federal Reserve banks. which are substantial. The important role of the FOMC will be discussed below. the primary function of the central bank was to smooth out fluctuations in the banking system by providing liquidity when needed. Nineteenth-century wariness of central government power led to great emphasis on a decentralized structure. and the board chairman in particular. not all of which relate to macroeconomic policy. The regional bank presidents sit on the FOMC and have voting privileges on a revolving basis. and the foreign exchange market interventions) are conducted by the New York bank. Each of the twelve regional Federal Reserve banks is owned by the member banks and controlled by a Board of Directors. are turned over to the Treasury. which is the rate which financial institutions pay for borrowing from the Fed. In practice.
The policy functions of the Federal Reserve banks are to: • • • Set the discount rate. the buying and selling of securities. who is a permanent voting member. with the exception of the president of the New York Fed.The act created the Federal Reserve system that exists today. the functions and activities of the system are now very different from what was originally envisioned. However. The Federal Reserve Bank of New York has considerably more influence than the other regional banks because some of the important policy operations of the system (open market operations. Originally.
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. Participate on the Federal Open Market Committee (FOMC). and each regional bank determines policy on how much borrowing to allow. The Federal reserve Banks and the Board of Governors play a diverse set of roles. and most of the nation’s largest banks are located in the New York district. the Board of Governors determines the rate that the regional banks are allowed to set.C. The functions of the Federal Reserve banks can be separated into “chore” functions and policy functions. D. it is almost always uniform across the country. The chore functions are to: • • • • Examine the member banks Review merger applications Provide check-clearing services and electronic funds transfers Act as an agent for the distribution of new currency and for the sale of Treasury securities. Today we emphasize the macroeconomic monetary policy role of the Federal Reserve but this function emerged only in the last few decades. the functions of the banks will be briefly outlined here. Although the structure of the central banking system has been largely the same for over 80 years. However. The Federal Reserve System consists of twelve regional banks and the seven-member Board of Governors which is located in Washington. Banks are discouraged from making use of borrowings from the Federal Reserve on a continuing basis. Therefore. the center of power in the entire system has tended over the years to shift away from the regional banks and the New York Fed in particular and toward the Board of Governors.

The chairman is also the dominant figure on the Federal Open Market Committee. The way in which the FOMC directs monetary policy has changed over the years. the Federal Reserve Bank of New York has several functions that are not shared with the other banks: • • • The Open Market Desk where transactions in government securities are conducted is located in the New York Fed. Set reserve requirements and approve changes in the discount rate. If changes in economic and financial conditions warrant. The formal functions of the Board include the following: • • • • Approve bank mergers. Fed officials do not meet with the President or his staff when considering monetary policy decisions. and so the governors rarely stay for full terms. and any U. This directive provides instructions to the managers of the Open Market Desk (at the New York Fed) about how to conduct open market operations. Arthur Burns). The regional banks are not government agencies and the Board of Governors is largely independent of the President and the Congress. the bank regulatory responsibilities of the Fed are less relevant to our focus on macroeconomic policy and will not be discussed in detail. Interestingly. Five of the twelve Federal Reserve Bank presidents are voting members of the FOMC at any one time. Direct open market operations through the FOMC. The chairman is the center of power for the whole Federal Reserve System.
The Board of Governors consists of seven members who hold 14-year terms and are appointed by the President. The New York Fed holds and manages the country’s gold stock. independent of political influence or concerns. The committee meets in Washington about 8 times a year and reviews economic conditions and the behavior of the financial system. At the present time. the term does not coincide with the President’s. The Federal Open Market Committee (FOMC) consists of the Board’s governors and the presidents of the regional banks. there is some modest oversight of the Fed’s policy making.S.
The Chairman of the Board directs the Board staff and is the most powerful individual in the system. The New York Fed holds the deposits and securities of foreign central banks. Monetary and banking policy are set by the Fed and not directly by elected officials. A major feature of the Federal Reserve system is its independence from the rest of the government. central bank intervention in the foreign exchange markets is directed there. The macroeconomic policy role of the Fed is centered on the activities of the FOMC.In addition. He or she is a board member appointed to a 4-year term as chairman by the President. the FOMC establishes a target for a particularly important short-term interest rate—the Federal Funds
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. Recent chairmen have become national public figures while in office (Alan Greenspan. Paul Volcker. Membership on the board is neither particularly remunerative nor very exciting. Set the regulations that determine what activities commercial banks are allowed to engage in. However. the committee holds a telephone consultation between its regular meetings and changes the directive. The purpose of the long term was to make the governors who are appointed by the President subject to congressional approval. Although enormously important to society. The Full Employment and Balanced Growth Act of 1978 requires that the Board chairman testify before congress twice a year on the monetary policy objectives of the Federal Reserve. The purpose of the meeting is to formulate a directive on monetary policy.

the money supply and the economy. Q. the banks and the public. Since the 1960s open market purchases and sales have become the dominant policy tool used to influence the money supply. we need to understand why this is the case—how does an open market purchase of securities by the Fed lead to an increase in the stock of money. I get a check from the Fed for the price of the bond and the check is written against the Fed itself. However. So. A bank with more reserve deposits than it would like to hold can lend them (sell Fed Funds) to another bank. The best way to see how open market operations work is to trace the effects of a purchase of an existing government bond by the central bank on the Fed. I take the Fed check and deposit it in my account at MY BANK.rate—which provides guidance for the purchase and sale of securities by the open market desk at the Federal Reserve Bank of New York. as we will see below. by making open market purchases. The Federal Funds rate is the rate at which reserve deposits (funds at the Fed or Fed Funds) are lent by one financial institution to another. it is not set by the Fed. there is a change in my balance sheet and my bank’s: T-bill THE FED Fed check
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. Open Market Operations The Federal Reserve can increase its holdings of government securities. Here’s what happens to the balance sheets: THE FED buys MY T-Bill: ME Fed check + T-bill Of course. In the next section. Imagine that THE FED buys a government bond from the public (ME). Thus. the buying and selling of securities by the Fed will have a very direct influence on the market Funds rate so the Fed can keep the Fed Funds rate at or near the target set by the FOMC. The reserve requirements are set (within a legislative framework) by the Board of Governors and the discount rate is determined by the Board as well. However. The money supply function clearly implies that M increases when Q goes up. The other Fed policy instruments are the reserve requirement ratio and the discount rate. It does so by buying and selling securities from the Fed’s portfolio (Q in the model above). the Fed Funds rate is a market determined interest rate. TOOLS OF MONETARY POLICY A simple and informative way of exploring the money supply relationship is to examine how changes in each of the policy variables affect the money supply. In the next section we will show how changes in Q affect interest rates. we return to our model framework and explain how each of the three monetary policy tools work.

I deposit the check in MY BANK: ME Bank deposit + Fed check My part in the transaction—the open market operation—is now complete. I sold my T-bill and I now hold money—a bank deposit—instead. MY BANK presents the check to the Fed for collection. The Fed credits MY BANK’s account at the Fed with the amount of the check and the open market purchase is concluded: MY BANK takes check to THE FED: MY BANK Fed check Reserve deposit + The summary below highlights the important implications of the Fed’s open market purchase on the balance sheet of the Fed and of the banks. An open market purchase adds to the Fed’s portfolio of government securities. The Fed pays for this by creating reserve deposits. For the banking system, the deposit balances of the public have increased and the bank’s reserves held at the Fed have also increased. There are important implications of this increase in reserve availability. First, there are more reserves available and the price at which reserves are borrowed and lent among financial institutions will change. The open market purchase increases reserves and the Fed Funds rate will fall. The Fed will use open market activities to influence the Fed Funds rate. Second, the increased availability of reserves will lead to changes in bank behavior. The banks will buy more assets and make more loans. The open market purchase increases reserves and leads to more bank lending and thus an expansion in the money supply. SUMMARY: The Effect of an Open Market Purchase on Securities Federal Reserve Bank Assets T-Bill Liabilities Reserve deposit Assets Reserve deposit My Bank Liabilities Public’s deposit Fed check THE FED Reserve deposit Fed check MY BANK Bank deposit

The Fed creates bank reserves when it purchases Treasury bills or other securities. The effect of this creation of bank reserves is to increase the money supply initially by the amount of the purchase. In addition, the amount of reserves in existence increases by the same amount. The banking system will find that it has excess reserves since its deposit liabilities and reserves have increased by the same amount.

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These excess reserves can then be used for loans and investments, and the ultimate impact on the money supply will exceed the initial increase due to the multiple expansion of deposits that was discussed above. Now suppose that the Fed sold $1m in government securities in the open market. If Mr. Y purchases these securities from the Fed and pays with a check drawn on an account at HIS BANK, the Fed’s assets will decline by $1 million as well as its liabilities. HIS BANK finds that its deposits have declined by $1 million and its reserves will also decline by this amount when the Fed clears the check by debiting HIS BANK’s account at the Fed. After the open market sale of securities by the Fed, HIS BANK finds itself short of reserves since deposits and reserves have declined by the same amount. As HIS BANK then reduces its loans and investments in order to increase its reserves, the process of multiple expansion of deposits will begin to operate in reverse, and the ultimate contraction of the money supply that results from the open market sale will exceed the initial size of the sale. When the Fed purchases securities, it adds reserves to the banking system and the Fed Funds rate declines. When the Fed sells securities, it drains reserves from the banking system and the Fed Funds rate increases. The Fed uses open market operations very actively on a daily basis. They are the primary tool of monetary policy which are used to increase and decrease reserves in the banking system in order to keep the Federal Funds rate very close to the target set by the FOMC. The target FED funds rate is determined by the FOMC as the rate that is associated with a desired level of economic activity and money growth. In addition to the open market operations required to meet policy goals, there is a very substantial volume of “defensive” purchases and sales of securities. The Fed takes defensive operations in order to offset the large and frequent random variations in the volume of reserves that occur as part of the normal operations of the banking system. Discount Rate The money supply function shows that an increase in the discount rate leads to a lower money supply. A higher discount rate, a higher cost of borrowing from the Fed, will discourage the banks from incurring reserve deficiencies since the cost of doing so increases. Thus, when the cost of borrowing from the central bank increases, the banks will tend to maintain higher reserve positions and be more careful to avoid costly borrowing of reserves from the Fed. Thus, an increase in the discount rate will tend to reduce the money supply. Discount borrowing was once the major tool of monetary policy used by the Fed. With the development of the Federal Funds—interbank market for reserves—market in the post-war period, discount borrowing became less important. A bank that finds itself short of reserves can borrow the reserves from other banks or sell assets, such as the banks own holding of securities, in order to increase its reserves position. Nevertheless, the discount window (as the borrowing facility is called) is still important. First, many small banks do not have ready access to the Federal Funds market where the minimum size of transactions is $5 million and most transactions exceed $25 million. Second, if a bank is in economic difficulty, it may not be able to borrow from other banks in the Fed Funds market. Lenders will not want the risk. The Fed uses the discount window to provide support for banks in trouble. As a result, the Fed will manage access to the discount window. The Fed usually keeps the discount rate below (about ¼ of a percentage point) the Fed Funds rate. This helps small banks that use the discount window. It could also be an inducement for banks to use the discount window except that the Fed limits access to the window. While the Fed does not have a formal rationing system for borrowed reserves, it discourages discount borrowing by monitoring individual banks’ behavior and discussing with them any perceived excessive use of the discount window for
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borrowing reserves. The Federal Reserve actively manages the privilege of borrowing at the discount rate. Banks and other depository institutions are discouraged from using discount borrowings on a regular basis. Borrowings are allowed to enable banks to meet temporary reserve deficiencies, but not as a continued source of reserve funds. Exceptions to this are seasonal borrowing by small banks which experience wide seasonal fluctuations in deposits or loans and the so-called extended credit facility, which the Fed uses to provide liquidity to banks in serious financial trouble. In any event, banks are not anxious to use the discount facility, because other banks may interpret such behavior as a signal that the bank is in financial difficulty. Changes in the discount rate can lead to changes in the level of borrowings (B, borrowed reserves) and therefore to changes in the level of bank reserves. However, this tool of Fed policy is generally agreed to have little direct effect on the money supply. The reasons for this are that borrowed reserves are generally not a large source of bank reserves, and that the Fed can easily offset any change in borrowing by member banks through its open market operations. However, changes in the discount rate are thought to be important as signal of Fed policy. Reserve Requirements If reserve requirements are increased, a bank that held not excess reserves before the reserve requirement increase will find that its reserve holdings are deficient and will have to adjust its portfolio in order to satisfy the reserve requirement. An increase in reserve requirement reduces the money supply because it forces the banks to reduce their loans outstanding or to sell other assets (e.g., securities) in order to hold more reserves. In both instances, deposit balances will fall (as the public pays back loans or pays for securities) and the money supply declines. Changes in the reserve requirement ratios—the amount of reserves that banks must hold for every dollar of deposits—are rarely used as a tool of monetary policy. Although the Fed has the ability to set reserve requirements within broad ranges dictated by Congress, changes in legal reserve requirements are made only infrequently. Reserve requirement ratio changes would be a very clumsy and inefficient tool for influencing the money supply. The Fed does not use reserve requirements for short-run control of the monetary system. Reserve requirements were extended and made largely uniform by a major banking reform bill in 1980, the Depository Institutions Deregulatory and Monetary Control Act (DIDMCA). Reserve requirements were extended to all depository institutions, and the structure of reserve requirements for various deposit types was vastly simplified. The changes were made to improve the Fed’s control over the money stock, which includes the liabilities of depository institutions other than commercial banks. However, since reserve balances at the Fed are not interest earning, the banks view them as an unfair burden that other financial institutions do not have. As a consequence, the fed has, over time, reduced the level of reserve requirements. Most recently, the reserve requirements on time and savings deposits (which had been 3%) were eliminated in December 1990 and the reserve requirement ratio on transaction accounts (including demand deposits) was reduced from 12% to 10% in April 1992. These steps were taken at this particular time to both ease the burden on the banks of reserve accounts that are non-interest earning and to influence monetary policy. In 1990–91, the Federal Reserve took several distinct steps to loosen monetary policy as an antirecessionary policy. Interest rates declined but the volume of new bank loans did not increase. The banks simply did not increase their loans to business and the money supply did not expand. The banks were not willing to expand their loan portfolios because of their concern with their own weak capital positions and the large amount of non-performing loans already in their portfolios.

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the operating target is the target for the Fed funds rate chosen by the FOMC.This episode was called a credit crunch because businesses without access to other sources of borrowing were squeezed out of the markets. Of course. The next section discusses the relationship between monetary policy and macroeconomic activity. The Fed now uses the target for the Fed Funds rate as its short-run policy target and relies on open market operations to influence interest rates. The initial impact of slower monetary growth is to raise interest rates. which inhibit borrowing and the expansion of economic activity. and high inflation produces high interest rates . First. The operating target that guides policy in the short-run is no longer the rate of growth of a money aggregate like M1 or M2.. interest rate changes do have an impact on the growth of the money aggregates. the FOMC still monitors money growth and it will influence their decision-making but money growth rates are too unpredictable to be used as a policy guide. monetary policy has a strong affect on real output. In the long run. the banks will raise the price of borrowing.. the situation is more complex. if reserves are in short supply. the Fed now places less emphasis on reserve requirements. The next issue to address is how policy actions effect the economy. As noted above. extended reserve requirements to all banking institutions and thus gave the Fed close control of M1. of faster monetary growth to lower interest
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. The Fed took the unusual step of reducing reserve requirements in order to offset the crunch. What are the magnitudes and timing of these effects of monetary policy on the economy? There is a rather clear consensus among economists concerning the answer to this question. The changes in reserve requirements are also a reflection of changes in the way the Fed determines monetary policy.. The credit crunch increased the severity of the recession. Soon thereafter. a tight monetary policy is associated with higher interest rates. Thus. Second. the effects on the inflation rate appear with a lag. Changes in monetary policy affect interest rates for additional reasons as well. Although the growth of the money aggregates—particularly M2—is an important mediumterm and long-term indicator of how monetary policy is working. which raises (lowers) interest rates.. Of course. the availability of reserves affects the banks’ willingness and ability to create money and generally expand the amount of borrowing and credit. Instead. open market sales (purchases) will push down (up) the price of government bonds. EFFECTS OF MONETARY POLICY Changes in the availability of reserves affect the macroeconomy in two ways. In the 1970s the Fed was strongly influenced by the monetarist point of view which gave great emphasis to the rate of growth of the money stock. innovations in banking technology made M1 a less important monetary aggregate than M2. the economy tends to its natural output equilibrium and money growth determines the inflation rate.. DIDMCA. loan rates go up. The changes in reserve requirements were being used at this time as a monetary policy action. Thus. Milton Friedman’s description of the relationship of monetary policy to the economy is anecdotal but informative: Over any long period of time . The policy tool or instrument most actively used by the Fed is open market operations. For example. that is. since 1990 only transactions deposits are subject to reserve requirements. the quantity of reserves available and direct control over the monetary aggregates. However. most of M2 is not subject to reserve requirements. the 1980 banking legislation. In fact. the Fed now pays little attention to money growth in the short-run. The reduction in reserve requirement ratios directly increases bank profitability (the banks can hold interest earning assets instead of reserve deposits at the Fed) and was intended to induce the banks to make more loans to business and to help end the recession. Higher monetary growth means high inflation. In the short-run.. Over shorter periods .

1 0. in turn.. The MPS model is maintained by the Federal Reserve Board staff and is used for forecasting and policy analysis.
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. Policy effects are estimated from the comparison of a model simulation with historical (actual) policy to another simulation based on a simulation disturbed by a policy shock.2 8 1. The total delay between monetary change and inflation is on the order of 18 to 24 months.3 12 0. as the markets have learned the longer-term relationships.0 -2. TABLE 3 Monetary Policy Simulations with the MPS Model Quarters after disturbance: 1 Real GNP (in %) GNP deflator (in %) Short-term interest rate. [Newsweek .6 0.rates. However. The exchange rate affects of monetary policy are the consequence of changes in interest rates. The rapid response of interest rates reflects market anticipations of the future effects of monetary growth. inflation and interest rates.5 0..3 -0. February 1987. The effect of monetary policy on the economy through the exchange rate affects has become stronger as international trade becomes more important. The long-run characteristic of the model (not shown) is that a 1% increase in M1 increases the price level by 1% and leads to no permanent change in output. Table 3 shows the effects of a permanent 1% increase in the level of M1 based on simulations of the 1981–85 period.5 16 -0. A robust real sector expansion begins in about a year and inflation effects do not appear until after 2 or 3 years.6 0.1 -0. first takes the form of higher growth in output and employment. Corporate bonds (in percentage points) 0. Higher interest rates begin to depress output after 4 years.8 4 1.5 1.4 0. “Structure and Uses of the MPS Quarterly Econometric Model of the United States.. monetary policy affects the exchange rate. The results show that a monetary expansion quickly affects interest rates.4
SOURCE: Flint Brayton and Eileen Mauskopf. the simulations are carried out dynamically over a long period so that the effects of the policy change over time can be estimated. December 29. The model consists of a large number of estimated behavioral equations that are supposed to represent the macroeconomy. The policy disturbance is introduced at one point and maintained at its new level.2 0. the duration of the short-term effects has become shorter and shorter .2 -0.” Federal Reserve Bulletin. Both shortterm and long-term interest rates fall dramatically in the quarter after the increase in the money supply. Commercial paper (in percentage points) Long-term interest rate. The typical pattern is that higher monetary growth is followed some three to nine months later by higher growth in total spending. The higher spending.7 2..9 0.3 0.
In addition to effects on output.1 0.. which make dollar denominated assets more or less attractive to hold and changes in inflation and expected inflation which alter the relative value of the dollar. The economy itself does not respond as rapidly. 1980] More specific answers are obtained from simulations of large-scale econometric models of the economy. In addition. and only later still of higher inflation .

K.. the legislative structure and budget goals have had some effect on the Congress. FISCAL POLICY The Keynesian approach to macroeconomics gave a great deal of emphasis to fiscal policy.
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. the Keynesian approach gained respectability in the first few post-World War II decades and policy-makers advocated the discretionary use of fiscal policy to stabilize the economy. that the deficit be eliminated by 1991. the focus of current interest is the persistent government deficit. there have been numerous attempts to reform the budgeting process and bring discipline to fiscal decision making. If the legislation survives judicial review (it may or may not). A change in the level of taxes collected will have a direct effect on disposable incomes and aggregate demand. the balance of trade improves when monetary policy is loosened. Japan and the U. The expenditure policies of the government have a clear impact on aggregate demand. which will affect the economy in two ways.S. Finally. the dollar depreciated in 1990 because the Federal Reserve eased monetary policy while the central banks of Germany. There are a large number of fiscal policy tools available. Since the budget deficit and increasing government expenditures have become a widely acknowledged problem in the U. Thus. to substitute domestically produced goods for imports is limited. it was somewhat surprising that Congress passed a limited line item veto in March 1996. the depreciation of the dollar will lead to higher dollar prices of imported goods. However. The supply side approach to macroeconomics emphasizes the importance of a fiscal policy that supports long-term growth of the economy. More specifically. Thus. the proposed reduction in capital gains taxation would increase the returns to equity investments and hopefully increase the amount of such investments. For example. Thus. In addition.S. Thus. It set specific targets for reduction of the deficit and set out means for assuring the outcome. Most economists agree that large and persistent deficits should have a detrimental effect on the economy. Second. the line item veto will shift some power to the President and could have a long-run influence on government expenditures. These proposals were never very popular in congress which guards its legislative powers closely. The imported inflation that resulted kept the inflation rate from falling even as the domestic economy weakened. First. was never met and the required sequestration of funds was always avoided.A looser monetary policy will lead to currency depreciation. exports more competitive in international markets. The Balanced Budget and Emergency Deficit Control Act (Grahman-Rudman-Hollings Act) of 1985 established new procedures for deficit control. a looser monetary policy leads to some imported inflation. tax changes are sometimes made on a temporary basis. particularly in the short-run. Since the ability. a dollar depreciation makes U. the academic responses to the tragedy of the Great Depression were often calls for fiscal policy activism. By the 1970s and 1980s fiscal policy was no longer viewed as a viable tool for short-run macroeconomic policy management. Contemporary discussion of fiscal policy are concerned with the long-run impact of government taxation and expenditure policies on economic growth. economy.S. The Graham Rudman target. Often tax changes are designed to change tax rates in a way that promotes one type of expenditure. For example. the act was not a total failure. There is a gradually emerging willingness to bring expenditure growth under control. Tax policy tools include both the personal and corporate income taxes. this leads to an increase in prices. maintained tight policy and high interest rates. There is less agreement about the extent to which the large deficits that persisted throughout the 1980s have had an effect on the economic performance of the U. For many years there have been proposals to give the President greater discretion over Federal government expenditure through a line item veto.

it is likely that the budget deficit as a fraction of GDP was smaller than it had been in any year since 1974. the Congress was more conservative in its approach and broad tax cuts were not enacted until 1964. However. That might not seem like a great deal of inflation but the average annual CPI inflation rate for the first half of the 1960s was only 1. The average unemployment rate reached 3. It seems that the consumer sector understood that a temporary tax increase has very little impact on their permanent or lifetime well being and therefore there was no necessity to adjust expenditure patterns. With vigorous economic growth in 1996. The goals of policy management were reiterated in the Full Employment and Balanced Growth Act of 1978 (the Humphrey-Hawkins Act). Throughout 1995. The act also established the Joint Economic Committee of the Congress and the Council of Economic Advisers. The average annual unemployment rate for the years 1958 through 1963 was 5. the total federal deficit is likely to fall below $100 billion for the first time in 15 years and below 1 percent of gross national product for the first time in 20 years. The confidence in the efficacy of fiscal policy disappeared very quickly when future attempts to use fiscal policy for macroeconomic stabilization were less successful. these targets were revised soon after they were put in place because unforeseen growth of nondiscretionary expenditures (particularly Medicare and Medicaid) and the lingering effects on tax revenues of the 1990–91 recession necessitated changes. consumers were barely affected. Thus. The Kennedy-Johnson tax cuts proved the efficacy of fiscal policy. the focus of the budget discussions has been how to bring the Federal budget into balance over a long period of time. However. The first administration to explicitly advocate fiscal policy activism was the Kennedy administration.In the Fall of 1990. by most indication. A restrictive fiscal policy seemed the appropriate move to take. The Vietnam war led to the expansion of aggregate demand in the late 1960s and inflationary pressures began to build as the economy pressed against capacity constraints. The Employment Act of 1946 sets out an objective for economic policy— maintaining full employment. which together made macroeconomic policy an explicit government function for the first time. administration and Congressional leaders negotiated a new set of budget procedures and deficit reduction plans. Of course. The 1995 Federal deficit was a bit more than $160 billion.8%. there was substantial sentiment in favor of a fiscal policy expansion.2%.4% in 1969 and the CPI inflation rate was up to 6. With much reluctance and delay the Congress finally enacted a one-year income tax surcharge in 1968. It fell to 5. The increase in taxes reduced disposable income and in theory was supposed to reduce consumer expenditures and reduce demand pressures in the economy. The Budget Enforcement Act of 1990 eliminates fixed deficit targets.
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. The Kennedy inauguration took place at the tail end of a mild 10-month recession which had followed a relatively short (two-year) expansion. the Congress and the President fought a long political battle concerning the budget and deficit reduction plans that culminated with a short shut down of the Federal government.0% in 1964 and 4. The congressional Budget Office reported that: As a result. The Budget Enforcement Act of 1990 set fiscal policy for the next five years and precluded any changes except emergency spending. Fiscal Policy Activism: 1960s and 1970s It was only in the post-World War II era that the Federal government assumed the responsibility for management of the economy. Throughout the 1980s.4% in 1965. by 1995. still a little more than 2 percent of GDP.2% per year. The act specifies that the Congress set spending limits and includes procedures that are designed to assure that the targets are met.

The implementation lag for fiscal policy is another 2 or 3 months. It took some time for the legislation to get through Congress and it was not until May 1975 that the rebates were paid. particularly tax changes. Policy Lags Generally speaking. The inside lag is the time it takes to formulate and execute a policy change. For fiscal policy the lag can again be several months. But in the post-war period.In 1975. Thus. The experience of the 1975 tax rebate showed that it might be impossible to time an appropriate fiscal policy response to a cyclical downturn. Once policy has been changed there is an outside lag or the time it takes for the policy change to effect the macroeconomy. it is difficult to design the appropriate size and type of policy change because the responses of economic agents to a policy change is not always predictable. b) data on macroeconomic developments are not immediately available and do not immediately present an unambiguous picture. the President was calling for a tax increase to hold down demand and inflation. Second. A fiscal policy change leads to a multiplier effect. which takes several quarters to get going. The personal savings rate increased for several months and consumer expenditure patterns did not begin to adjust to the increase in disposable income until year-end. in the midst of the long and deep recession that followed the first OPEC oil price shock. fiscal policy is hardly a useful tool for short-run stabilization policy. These two episodes illustrate two major problems with the use of fiscal policy for macroeconomic stabilization. the congress passed an income tax rebate. For monetary policy the decision lag is relatively short (about one month) because there are regular meetings of the Federal Open Market Committee. the lags in the effect of any policy change on the economy can be characterized into an inside lag and an outside lag. Decision lag – the time it takes for the policy-makers to make a decision about policy. The oil shock in October 1973 pushed the inflation rate up and inflation was the primary concern of policy-makers throughout 1974. the fiscal policy lag is about a year. All in all the inside lags are likely to take at least six months. For monetary policy the implementation lag is very short. For fiscal policy. Consumer and business responses to policy changes. It can be separated into three components: Recognition lag – the time between an economic disturbance and the recognition by policy-makers that a policy response is required. however. Finally. it would typically take 3 months after the peak in activity to recognize that a recession has begun. In the case of an economy entering a slowdown. The recognition lag occurs because a) forecasting is not reliable enough to use as a basis for a major change in policy. An expansionary fiscal policy was not proposed until January 1975. The decision lag is likely to be at least another 2 or 3 months. will vary from episode to episode. recession has on average lasted only about 11 months. First. The experience with the tax surcharge in 1968 showed that the response of the macroeconomy to a fiscal policy change is hard to predict.
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. the delays inherent in putting a policy change in place often make it impossible to make a fiscal policy response at the appropriate time. Thus. Implementation lag – the time it takes for a policy change to be put in place. and the full effect is not felt for about a year. Estimates of the recognition lag suggest that it is usually about 3 to 6 months. Even as the recession emerged in mid-and late 1974. several months pass before the multiplier process has a significant effect on aggregate demand. A task as simple as promulgating and putting into action new withholding rates can take at least several weeks. the decision lag can be lengthy because congressional action is necessary. open market operations in response to an FOMC meeting decision will start within hours. By that time the expansion in economic activity had already begun.

We will present simulation results from one particular model.
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. The deficit could be larger because of changes in government expenditure and revenue that occur because of economic conditions. EFFECTS OF FISCAL POLICY The magnitude and timing of the effect of a change in fiscal policy on the economy can best be estimated from a large-scale econometric model. The calculation starts with a measure of trend Gross Domestic Product in constant dollars. the MPS model used by the Federal Reserve Board staff. In each case the control simulation is an historical dynamic simulation for the period 1981–85. The disturbed simulation introduces a permanent increase in real government expenditures equal to 1 percent of real GNP. the deficit widens in recession even without any change in the stance of fiscal policy. A better measure of fiscal policy and the deficit is one that removes the effects of cyclical change on the deficit: The cyclically adjusted budget is an estimate of what the Federal budget would be after removing the automatic responses of receipts and expenditures to economic fluctuations. transfer payments) increase automatically in a recession and revenues decline as income falls. the same model that was used for the monetary policy simulation earlier. This occurs because expenditures (particularly. Then government expenditures and revenues that would occur at the trend level of GDP are calculated. Simulations from different models will differ but there is some general agreement about the effects of policy.Measuring Fiscal Policy It is not correct to say that an increasing deficit is an indication that fiscal policy is expansionary. Thus. Table 4 shows three simulations with versions of the MPS model which illustrate how the effects of fiscal policy interact with monetary policy. Changes in the cyclically adjusted deficit then represent true change in the fiscal policy stance of the government.

7 2.9 1.2 1. In the absence of any accommodating expansion of monetary policy. the full multiplier effect is quite large.1 1. there are not capacity constraints.1 1. Full Model and fixed money supply (Total Supply and Demand) Real GNP growth Federal Funds rate GNP deflator growth 1. “Structure and Uses of the MPS quarterly Econometric Model of the United States.4 1.7 after three years.3 in the first quarter but it is 2. The second case shows that the multiplier effects in a simple Keynesian model are “crowded out” by changes in the financial markets.3 3. and it takes about two years for the multiplier effects to occur. February 1987. Thus.” Comparison of cases one and two for the MPS model indicates that transactions crowding out is sizable. Interest rate effects of the changes induced by the fiscal expansion are assumed not to exist. It takes a few quarters from the start of the policy disturbance for the multiplier process to get started. over three. In addition. In the second case the multiplier effect on real GNP peaks at 1.7 0.5 0. interest rates will rise and hold back the multiplier process.0 1. The effect of the fiscal expansion on the Federal Funds rate is also shown.
The first case corresponds to a simple Keynesian real sector multiplier model.Table 4 Fiscal Policy Simulations with the MPS Model Quarters after disturbance: 1 1. This is called “transactions crowding out.2 0.2 1.4 1. There is no monetary accommodation so the money supply is fixed but all the interest rate.0 0.4 1. supply is viewed as exogenous.0 1. A fiscal expansion leads to increased economic activity that increases the demand for money.1 0.3 1.7 2 4 8 12
SOURCE: Flint Brayton and Eileen Mauskopf.3 1.3 1.9 0.4 after a year and then falls.2 1. Interest rates are held constant and the money supply increases to satisfy any increase in money demand.1 3. The multiplier effect is only 1.0 1. The third case represents a simulation of the full MPS model. price and supply effects that are started by the fiscal
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. This case corresponds to an IS-LM model framework.3 at the end of one year.” Federal Reserve Bulletin.8 1.4 0.8 1. Exogenous supply and fixed money supply (IS-LM) Real GNP growth Federal Funds rate 3. and 3.3 1. The multiplier is large because the model is simple—there are no changes in interest rates or prices.2 2. Exogenous supply and fixed interest rate (Simple Keynesian) Real GNP growth 2.

The effects on interest rates and inflation become more important and by the end of three years the real GNP effect is barely more than zero. In the long run.expansion are allowed to come into play.
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. This simulation corresponds to the short-run and long-run analysis of the total supply and demand model. The fiscal expansion has a short-run effect on real GNP but it is not large and peaks within a year. The inflation effects do not appear for several quarters and then grow larger. inflation and interest rates are substantially higher and real output is virtually unaffected.